Big Sunday happily welcomes you to Our Really Big Community Calendar

We try to include all kinds of volunteering and helping opportunities for all kinds of interests, talents, passions, and ages! As you’ll see, these include volunteering opportunities (one-time and long-term) as well as the chance to support a nonprofit by attending fundraising events. Plus, of course, we include all of Big Sunday’s homegrown events, too! Whoever you are, and whatever you do, there is someone out there who could use your help.

If you have questions about our calendar, or would like to add a listing, please contact calendar@bigsunday.org or submit your event/opportunity via the button below.

Big Sunday Event Giving Opportunity! One-time Volunteer Opportunity Ongoing Volunteer Opportunity
Sun Mon Tue Wed Thu Fri Sat
1
OC Animal Care Volunteer
OC Animal Care Volunteer @ OC Animal Care
Sep 1 all-day
OC Animal Care Volunteer @ OC Animal Care | Orange | California | United States
If you are searching for a rewarding experience and love working with and for animals, we invite you to join the OC Animal Care volunteer team. Volunteer opportunities are available seven days a week. Volunteers[...]
AHEAD With Horses Inc. 8:45 am
AHEAD With Horses Inc.
Sep 1 @ 8:45 am – 2:30 pm
AHEAD With Horses Inc. @ Los Angeles | California | United States
We are always happy to have people interested in volunteering!    We have a short orientation every Saturday morning at 8:45am in Shadow Hills. (Rain will normally cancel and we are closed for major 3-day[...]
Second Chances Leadership Program 10:00 am
Second Chances Leadership Program @ USC Social Sciences Building, RM B52
Sep 1 @ 10:00 am – 2:00 pm
Second Chances Leadership Program was designed to build and develop the self-confidence, life and leadership skills of youth through interactive learning, in-class discussions, presentations, panels, workshops, and exploratory field-trips. Upon conclusion, participants will be able[...]
2
One Generation Farmers Market Volunteer 7:00 am
One Generation Farmers Market Volunteer @ One Generation
Sep 2 @ 7:00 am – 1:00 pm
Every Sunday volunteers sign in at 7am and out at 1pm to help greet at the entrance gates and offer information about ONEgeneration services, help at the Bagel or Book booths, or assist a Farmers[...]
Food on Foot 3:15 pm
Food on Foot @ Gay and Lesbian Center
Sep 2 @ 3:15 pm – 5:00 pm
You can help distribute food and clothing to the homeless and poor on any Sunday, from 3:15pm to 5:00pm, in our Hollywood location (1625 N. Schrader Blvd.) Devoting 90 minutes of your time has a[...]
3
North Hollywood Interfaith Food Pantry
North Hollywood Interfaith Food Pantry
Sep 3 all-day
The North Hollywood Interfaith Food Pantry is always delighted to have new volunteers and there are several ways to get involved: There are several packing teams who pack groceries at Temple Beth Hillel.  Dates and[...]
Big Sunday’s MM@10 10:00 am
Big Sunday’s MM@10 @ Big Sunday
Sep 3 @ 10:00 am – 11:30 am
Big Sunday’s MM@10 @ Big Sunday | Los Angeles | California | United States
Each Monday morning at 10 am, we host a fun, hands-on service project at Big Sunday headquarters called MM@10 (Monday Mornings at 10).  It’s a great way for folks of all ages to get together to help[...]
4
Homeless Service Center 8:00 am
Homeless Service Center @ St. Joseph Center
Sep 4 @ 8:00 am – 12:00 pm
Our Homeless Service Center connects homeless individuals and families with services, housing and case management. We provide laundry facilities, showers, mail boxes and assistance with registering to receive hot meals at Bread & Roses Cafe.[...]
Skid Row Outreach 10:30 am
Skid Row Outreach @ Los Angeles Central Corps Community Center
Sep 4 @ 10:30 am – 1:00 pm
As the area called Skid Row continues to grow in downtown Los Angeles, The Salvation Army will continue to be there for the individuals who live there. By offering lunch every Tuesday and Thursday this[...]
5
North Hollywood Interfaith Food Pantry
North Hollywood Interfaith Food Pantry
Sep 5 all-day
The North Hollywood Interfaith Food Pantry is always delighted to have new volunteers and there are several ways to get involved: There are several packing teams who pack groceries at Temple Beth Hillel.  Dates and[...]
Homeless Service Center 8:00 am
Homeless Service Center @ St. Joseph Center
Sep 5 @ 8:00 am – 12:00 pm
Our Homeless Service Center connects homeless individuals and families with services, housing and case management. We provide laundry facilities, showers, mail boxes and assistance with registering to receive hot meals at Bread & Roses Cafe.[...]
6
Big Sunday’s TM@10 10:00 am
Big Sunday’s TM@10 @ Big Sunday
Sep 6 @ 10:00 am – 11:30 am
Big Sunday’s TM@10 @ Big Sunday | Los Angeles | California | United States
Join us for TM@10 (Thursday Mornings at 10) at Big Sunday headquarters where we’ll host a different service project each week that benefits a worthy cause! Enjoy good food, good company and good deeds; everyone[...]
Skid Row Outreach 10:30 am
Skid Row Outreach @ Los Angeles Central Corps Community Center
Sep 6 @ 10:30 am – 1:00 pm
As the area called Skid Row continues to grow in downtown Los Angeles, The Salvation Army will continue to be there for the individuals who live there. By offering lunch every Tuesday and Thursday this[...]
7
Homeless Service Center 8:00 am
Homeless Service Center @ St. Joseph Center
Sep 7 @ 8:00 am – 12:00 pm
Our Homeless Service Center connects homeless individuals and families with services, housing and case management. We provide laundry facilities, showers, mail boxes and assistance with registering to receive hot meals at Bread & Roses Cafe.[...]
8
AHEAD With Horses Inc. 8:45 am
AHEAD With Horses Inc.
Sep 8 @ 8:45 am – 2:30 pm
AHEAD With Horses Inc. @ Los Angeles | California | United States
We are always happy to have people interested in volunteering!    We have a short orientation every Saturday morning at 8:45am in Shadow Hills. (Rain will normally cancel and we are closed for major 3-day[...]
Second Chances Leadership Program 10:00 am
Second Chances Leadership Program @ USC Social Sciences Building, RM B52
Sep 8 @ 10:00 am – 2:00 pm
Second Chances Leadership Program was designed to build and develop the self-confidence, life and leadership skills of youth through interactive learning, in-class discussions, presentations, panels, workshops, and exploratory field-trips. Upon conclusion, participants will be able[...]
9
OC Animal Care Volunteer
OC Animal Care Volunteer @ OC Animal Care
Sep 9 all-day
OC Animal Care Volunteer @ OC Animal Care | Orange | California | United States
If you are searching for a rewarding experience and love working with and for animals, we invite you to join the OC Animal Care volunteer team. Volunteer opportunities are available seven days a week. Volunteers[...]
One Generation Farmers Market Volunteer 7:00 am
One Generation Farmers Market Volunteer @ One Generation
Sep 9 @ 7:00 am – 1:00 pm
Every Sunday volunteers sign in at 7am and out at 1pm to help greet at the entrance gates and offer information about ONEgeneration services, help at the Bagel or Book booths, or assist a Farmers[...]
Turnover Day at the Greystone Demonstration Garden 10:00 am
Turnover Day at the Greystone Demonstration Garden @ Greystone Mansion
Sep 9 @ 10:00 am – 12:00 pm
We are hosting a turnover day in the garden, this coming Sunday, Septmeber 9th, from 10-noon. We will supply all the tools, we’re going to compost our old summer crops and add in soil amendments[...]
Food on Foot 3:15 pm
Food on Foot @ Gay and Lesbian Center
Sep 9 @ 3:15 pm – 5:00 pm
You can help distribute food and clothing to the homeless and poor on any Sunday, from 3:15pm to 5:00pm, in our Hollywood location (1625 N. Schrader Blvd.) Devoting 90 minutes of your time has a[...]
10
North Hollywood Interfaith Food Pantry
North Hollywood Interfaith Food Pantry
Sep 10 all-day
The North Hollywood Interfaith Food Pantry is always delighted to have new volunteers and there are several ways to get involved: There are several packing teams who pack groceries at Temple Beth Hillel.  Dates and[...]
Big Sunday’s MM@10 10:00 am
Big Sunday’s MM@10 @ Big Sunday
Sep 10 @ 10:00 am – 11:30 am
Big Sunday’s MM@10 @ Big Sunday | Los Angeles | California | United States
Each Monday morning at 10 am, we host a fun, hands-on service project at Big Sunday headquarters called MM@10 (Monday Mornings at 10).  It’s a great way for folks of all ages to get together to help[...]
11
OC Animal Care Volunteer
OC Animal Care Volunteer @ OC Animal Care
Sep 11 all-day
OC Animal Care Volunteer @ OC Animal Care | Orange | California | United States
If you are searching for a rewarding experience and love working with and for animals, we invite you to join the OC Animal Care volunteer team. Volunteer opportunities are available seven days a week. Volunteers[...]
Skid Row Outreach 10:30 am
Skid Row Outreach @ Los Angeles Central Corps Community Center
Sep 11 @ 10:30 am – 1:00 pm
As the area called Skid Row continues to grow in downtown Los Angeles, The Salvation Army will continue to be there for the individuals who live there. By offering lunch every Tuesday and Thursday this[...]
The Greystone Demonstration Garden 11:34 pm
The Greystone Demonstration Garden @ Greystone Gardens
Sep 11 @ 11:34 pm – Sep 12 @ 12:34 am
The Greystone Demonstration Garden is a dedicated space for community gardening projects and education.  It's approximately 2150 square feet and sits on 18.3 acres of land at Greystone Mansion & Gardens:  The Doheny Estate, owned[...]
12
North Hollywood Interfaith Food Pantry
North Hollywood Interfaith Food Pantry
Sep 12 all-day
The North Hollywood Interfaith Food Pantry is always delighted to have new volunteers and there are several ways to get involved: There are several packing teams who pack groceries at Temple Beth Hillel.  Dates and[...]
The Center in Hollywood
The Center in Hollywood @ The Center in Hollywood
Sep 12 all-day
Regular volunteers commit to serving at The Center 1+ days a week in the capacity of participating in or leading groups, attending coffee hour, cleaning, or assisting with office work. Weekly shifts range from 1.5-8[...]
13
Big Sunday’s TM@10 10:00 am
Big Sunday’s TM@10 @ Big Sunday
Sep 13 @ 10:00 am – 11:30 am
Big Sunday’s TM@10 @ Big Sunday | Los Angeles | California | United States
Join us for TM@10 (Thursday Mornings at 10) at Big Sunday headquarters where we’ll host a different service project each week that benefits a worthy cause! Enjoy good food, good company and good deeds; everyone[...]
Skid Row Outreach 10:30 am
Skid Row Outreach @ Los Angeles Central Corps Community Center
Sep 13 @ 10:30 am – 1:00 pm
As the area called Skid Row continues to grow in downtown Los Angeles, The Salvation Army will continue to be there for the individuals who live there. By offering lunch every Tuesday and Thursday this[...]
14
New Directions for Veterans
New Directions for Veterans
Sep 14 all-day
NDVets Memorial Day 5K We look for friendly, energetic volunteers to assist with our 5K run/walk. We need volunteers to help with everything from Check-In, staffing water stations, and cheering on walkers and runners along the[...]
15
I Have a Dream Foundation
I Have a Dream Foundation
Sep 15 all-day
 Your volunteer work at “I Have a Dream” Foundation – Los Angeles (IHADLA) will make a difference in the lives of underprivileged youth in Los Angeles. Volunteers tutor, coach, read to our students (“Dreamers”), chaperone field[...]
OC Animal Care Volunteer
OC Animal Care Volunteer @ OC Animal Care
Sep 15 all-day
OC Animal Care Volunteer @ OC Animal Care | Orange | California | United States
If you are searching for a rewarding experience and love working with and for animals, we invite you to join the OC Animal Care volunteer team. Volunteer opportunities are available seven days a week. Volunteers[...]
AHEAD With Horses Inc. 8:45 am
AHEAD With Horses Inc.
Sep 15 @ 8:45 am – 2:30 pm
AHEAD With Horses Inc. @ Los Angeles | California | United States
We are always happy to have people interested in volunteering!    We have a short orientation every Saturday morning at 8:45am in Shadow Hills. (Rain will normally cancel and we are closed for major 3-day[...]
Family Volunteer Days at George F. Canyon 10:00 am
Family Volunteer Days at George F. Canyon @ 27305 Palos Verdes Drive East Rolling Hills Estates, CA90274
Sep 15 @ 10:00 am – 11:00 am
Join us at George F Canyon Nature Center every 3rd Saturday from 10am to 11am for a fun volunteer day for the whole family! Volunteers will learn about environmental stewardship while engaging in fun activities[...]
Second Chances Leadership Program 10:00 am
Second Chances Leadership Program @ USC Social Sciences Building, RM B52
Sep 15 @ 10:00 am – 2:00 pm
Second Chances Leadership Program was designed to build and develop the self-confidence, life and leadership skills of youth through interactive learning, in-class discussions, presentations, panels, workshops, and exploratory field-trips. Upon conclusion, participants will be able[...]
16
One Generation Farmers Market Volunteer 7:00 am
One Generation Farmers Market Volunteer @ One Generation
Sep 16 @ 7:00 am – 1:00 pm
Every Sunday volunteers sign in at 7am and out at 1pm to help greet at the entrance gates and offer information about ONEgeneration services, help at the Bagel or Book booths, or assist a Farmers[...]
Food on Foot 3:15 pm
Food on Foot @ Gay and Lesbian Center
Sep 16 @ 3:15 pm – 5:00 pm
You can help distribute food and clothing to the homeless and poor on any Sunday, from 3:15pm to 5:00pm, in our Hollywood location (1625 N. Schrader Blvd.) Devoting 90 minutes of your time has a[...]
17
North Hollywood Interfaith Food Pantry
North Hollywood Interfaith Food Pantry
Sep 17 all-day
The North Hollywood Interfaith Food Pantry is always delighted to have new volunteers and there are several ways to get involved: There are several packing teams who pack groceries at Temple Beth Hillel.  Dates and[...]
Big Sunday’s MM@10 10:00 am
Big Sunday’s MM@10 @ Big Sunday
Sep 17 @ 10:00 am – 11:30 am
Big Sunday’s MM@10 @ Big Sunday | Los Angeles | California | United States
Each Monday morning at 10 am, we host a fun, hands-on service project at Big Sunday headquarters called MM@10 (Monday Mornings at 10).  It’s a great way for folks of all ages to get together to help[...]
18
Homeless Service Center 8:00 am
Homeless Service Center @ St. Joseph Center
Sep 18 @ 8:00 am – 12:00 pm
Our Homeless Service Center connects homeless individuals and families with services, housing and case management. We provide laundry facilities, showers, mail boxes and assistance with registering to receive hot meals at Bread & Roses Cafe.[...]
Skid Row Outreach 10:30 am
Skid Row Outreach @ Los Angeles Central Corps Community Center
Sep 18 @ 10:30 am – 1:00 pm
As the area called Skid Row continues to grow in downtown Los Angeles, The Salvation Army will continue to be there for the individuals who live there. By offering lunch every Tuesday and Thursday this[...]
19
North Hollywood Interfaith Food Pantry
North Hollywood Interfaith Food Pantry
Sep 19 all-day
The North Hollywood Interfaith Food Pantry is always delighted to have new volunteers and there are several ways to get involved: There are several packing teams who pack groceries at Temple Beth Hillel.  Dates and[...]
Homeless Service Center 8:00 am
Homeless Service Center @ St. Joseph Center
Sep 19 @ 8:00 am – 12:00 pm
Our Homeless Service Center connects homeless individuals and families with services, housing and case management. We provide laundry facilities, showers, mail boxes and assistance with registering to receive hot meals at Bread & Roses Cafe.[...]
20
Big Sunday’s TM@10 10:00 am
Big Sunday’s TM@10 @ Big Sunday
Sep 20 @ 10:00 am – 11:30 am
Big Sunday’s TM@10 @ Big Sunday | Los Angeles | California | United States
Join us for TM@10 (Thursday Mornings at 10) at Big Sunday headquarters where we’ll host a different service project each week that benefits a worthy cause! Enjoy good food, good company and good deeds; everyone[...]
Skid Row Outreach 10:30 am
Skid Row Outreach @ Los Angeles Central Corps Community Center
Sep 20 @ 10:30 am – 1:00 pm
As the area called Skid Row continues to grow in downtown Los Angeles, The Salvation Army will continue to be there for the individuals who live there. By offering lunch every Tuesday and Thursday this[...]
21
Homeless Service Center 8:00 am
Homeless Service Center @ St. Joseph Center
Sep 21 @ 8:00 am – 12:00 pm
Our Homeless Service Center connects homeless individuals and families with services, housing and case management. We provide laundry facilities, showers, mail boxes and assistance with registering to receive hot meals at Bread & Roses Cafe.[...]
22
AHEAD With Horses Inc. 8:45 am
AHEAD With Horses Inc.
Sep 22 @ 8:45 am – 2:30 pm
AHEAD With Horses Inc. @ Los Angeles | California | United States
We are always happy to have people interested in volunteering!    We have a short orientation every Saturday morning at 8:45am in Shadow Hills. (Rain will normally cancel and we are closed for major 3-day[...]
Artist Needed!! 10:00 am
Artist Needed!! @ Westside Children Center
Sep 22 @ 10:00 am – 12:00 pm
At Westside Children’s Center, we provide thousands of at-risk children and their families with critical, high-quality early education programs, family strengthening interventions for families at risk of abusing or neglecting their children, foster care and adoption[...]
Second Chances Leadership Program 10:00 am
Second Chances Leadership Program @ USC Social Sciences Building, RM B52
Sep 22 @ 10:00 am – 2:00 pm
Second Chances Leadership Program was designed to build and develop the self-confidence, life and leadership skills of youth through interactive learning, in-class discussions, presentations, panels, workshops, and exploratory field-trips. Upon conclusion, participants will be able[...]
23
OC Animal Care Volunteer
OC Animal Care Volunteer @ OC Animal Care
Sep 23 all-day
OC Animal Care Volunteer @ OC Animal Care | Orange | California | United States
If you are searching for a rewarding experience and love working with and for animals, we invite you to join the OC Animal Care volunteer team. Volunteer opportunities are available seven days a week. Volunteers[...]
One Generation Farmers Market Volunteer 7:00 am
One Generation Farmers Market Volunteer @ One Generation
Sep 23 @ 7:00 am – 1:00 pm
Every Sunday volunteers sign in at 7am and out at 1pm to help greet at the entrance gates and offer information about ONEgeneration services, help at the Bagel or Book booths, or assist a Farmers[...]
Food on Foot 3:15 pm
Food on Foot @ Gay and Lesbian Center
Sep 23 @ 3:15 pm – 5:00 pm
You can help distribute food and clothing to the homeless and poor on any Sunday, from 3:15pm to 5:00pm, in our Hollywood location (1625 N. Schrader Blvd.) Devoting 90 minutes of your time has a[...]
24
North Hollywood Interfaith Food Pantry
North Hollywood Interfaith Food Pantry
Sep 24 all-day
The North Hollywood Interfaith Food Pantry is always delighted to have new volunteers and there are several ways to get involved: There are several packing teams who pack groceries at Temple Beth Hillel.  Dates and[...]
Big Sunday’s MM@10 10:00 am
Big Sunday’s MM@10 @ Big Sunday
Sep 24 @ 10:00 am – 11:30 am
Big Sunday’s MM@10 @ Big Sunday | Los Angeles | California | United States
Each Monday morning at 10 am, we host a fun, hands-on service project at Big Sunday headquarters called MM@10 (Monday Mornings at 10).  It’s a great way for folks of all ages to get together to help[...]
25
Ascencia
Ascencia @ Ascencia
Sep 25 all-day
Group Service Opportunities Corporate Opportunities: Interested in getting your company or large group involved? We have a few opportunities available: Groups 3-15, check out our Guest Chef Program Corporate groups (15 or more), host a[...]
OC Animal Care Volunteer
OC Animal Care Volunteer @ OC Animal Care
Sep 25 all-day
OC Animal Care Volunteer @ OC Animal Care | Orange | California | United States
If you are searching for a rewarding experience and love working with and for animals, we invite you to join the OC Animal Care volunteer team. Volunteer opportunities are available seven days a week. Volunteers[...]
Skid Row Outreach 10:30 am
Skid Row Outreach @ Los Angeles Central Corps Community Center
Sep 25 @ 10:30 am – 1:00 pm
As the area called Skid Row continues to grow in downtown Los Angeles, The Salvation Army will continue to be there for the individuals who live there. By offering lunch every Tuesday and Thursday this[...]
26
North Hollywood Interfaith Food Pantry
North Hollywood Interfaith Food Pantry
Sep 26 all-day
The North Hollywood Interfaith Food Pantry is always delighted to have new volunteers and there are several ways to get involved: There are several packing teams who pack groceries at Temple Beth Hillel.  Dates and[...]
The Center in Hollywood
The Center in Hollywood @ The Center in Hollywood
Sep 26 all-day
Regular volunteers commit to serving at The Center 1+ days a week in the capacity of participating in or leading groups, attending coffee hour, cleaning, or assisting with office work. Weekly shifts range from 1.5-8[...]
27
Good Shepard Center
Good Shepard Center
Sep 27 all-day
Volunteers are essential to the success of Good Shepherd Center and help us improve the lives of homeless women and children in our community. We would love to have you join our team as a volunteer.[...]
Big Sunday’s TM@10 10:00 am
Big Sunday’s TM@10 @ Big Sunday
Sep 27 @ 10:00 am – 11:30 am
Big Sunday’s TM@10 @ Big Sunday | Los Angeles | California | United States
Join us for TM@10 (Thursday Mornings at 10) at Big Sunday headquarters where we’ll host a different service project each week that benefits a worthy cause! Enjoy good food, good company and good deeds; everyone[...]
Skid Row Outreach 10:30 am
Skid Row Outreach @ Los Angeles Central Corps Community Center
Sep 27 @ 10:30 am – 1:00 pm
As the area called Skid Row continues to grow in downtown Los Angeles, The Salvation Army will continue to be there for the individuals who live there. By offering lunch every Tuesday and Thursday this[...]
28
New Directions for Veterans
New Directions for Veterans
Sep 28 all-day
NDVets Memorial Day 5K We look for friendly, energetic volunteers to assist with our 5K run/walk. We need volunteers to help with everything from Check-In, staffing water stations, and cheering on walkers and runners along the[...]
29
OC Animal Care Volunteer
OC Animal Care Volunteer @ OC Animal Care
Sep 29 all-day
OC Animal Care Volunteer @ OC Animal Care | Orange | California | United States
If you are searching for a rewarding experience and love working with and for animals, we invite you to join the OC Animal Care volunteer team. Volunteer opportunities are available seven days a week. Volunteers[...]
AHEAD With Horses Inc. 8:45 am
AHEAD With Horses Inc.
Sep 29 @ 8:45 am – 2:30 pm
AHEAD With Horses Inc. @ Los Angeles | California | United States
We are always happy to have people interested in volunteering!    We have a short orientation every Saturday morning at 8:45am in Shadow Hills. (Rain will normally cancel and we are closed for major 3-day[...]
Artist Needed!! 10:00 am
Artist Needed!! @ Westside Children Center
Sep 29 @ 10:00 am – 12:00 pm
At Westside Children’s Center, we provide thousands of at-risk children and their families with critical, high-quality early education programs, family strengthening interventions for families at risk of abusing or neglecting their children, foster care and adoption[...]
Second Chances Leadership Program 10:00 am
Second Chances Leadership Program @ USC Social Sciences Building, RM B52
Sep 29 @ 10:00 am – 2:00 pm
Second Chances Leadership Program was designed to build and develop the self-confidence, life and leadership skills of youth through interactive learning, in-class discussions, presentations, panels, workshops, and exploratory field-trips. Upon conclusion, participants will be able[...]
30
One Generation Farmers Market Volunteer 7:00 am
One Generation Farmers Market Volunteer @ One Generation
Sep 30 @ 7:00 am – 1:00 pm
Every Sunday volunteers sign in at 7am and out at 1pm to help greet at the entrance gates and offer information about ONEgeneration services, help at the Bagel or Book booths, or assist a Farmers[...]
Food on Foot 3:15 pm
Food on Foot @ Gay and Lesbian Center
Sep 30 @ 3:15 pm – 5:00 pm
You can help distribute food and clothing to the homeless and poor on any Sunday, from 3:15pm to 5:00pm, in our Hollywood location (1625 N. Schrader Blvd.) Devoting 90 minutes of your time has a[...]

How it Works

You can SEARCH by scrolling through the Months or by selecting different Categories or Tag functions. For a totally different view, try the Posterboard or Stream options! Feel free to submit an item for the calendar by clicking the “Submit Your Event / Opportunity” button above at the right-hand side of the page. Questions? Email calendar@bigsunday.org.