There is always the original “Big Event.” The team from A&M has traveled all across the country helping other universities create their own day of service. Almost all SEC schools do it now. Can you imagine over 20,000 students coming together to serve? I believe there is a place on the website that you can ask them to help you plan your own.
https://bigeventonline.tamu.edu EDIT: here is the direct link for their planning packet for other schools.
https://bigevent.tamu.edu/start-a-big-event/