pulled pork sandwiches- get some pulled pork, buns, coleslaw, pasta salad, beans, sliced watermelon
(the pasta salad and beans cover the non-meat/pork eaters)

You can just put it out and let people serve themselves- borrow a crock pot or two and everything will stay warm- You won't need to tend to food this way.

Also- put a couple of cheese/cracker platters out