1st b-day party. What do I feed the guests? ?

The party starts at 1pm. I'm not asking about what to feed the kiddo, I've got that under control. It's the 45-50 hungry adults that I don't know what to do about... It will be family and friends, nothing formal. Not sure if I need to provide sandwiches, etc since it's technically after lunch time or not. I need ideas that will be ok sitting out or that can be done in a crock pot. Nothing fancy, please! Thanks!