Baptism party help

I am in search of an idea for an economical entree to serve at a baptism party over Memorial Day weekend.  We had initially planned to grill out, but don't have a good source for hamburger patties (no Sam's Club or Costco nearby) and ground hamburger is expensive here. We expect 50-75 people, as we live in a Catholic college town with lots of large families.

Criteria:

-The baptism will follow a 10:30 Mass.  I need something that can be prepared ahead and kept warm in the oven or slow cooker while we are at church so it is ready to serve soon after we get home.

-People often serve pulled pork at these parties, but we are coming off a stretch of Confirmations, First Communions, and graduations, so I was looking for something different, although using pulled pork in a taco bar could be fun.

-Ditto for ham, following Easter.

I would love to hear your ideas!