S.L.
For my son's birthday last year we did a big pan of baked ziti, a pan of eggplant parm, crusty garlic bread, and a big salad. We are vegetarian, but all of the guests were not, so my MIL also brought a crockpot with meatballs to serve with it. It was nice because everything was prepared ahead of time and just put in the oven the day of the party to heat up.
I also went to a party recently where they had pizza already made up for the adults and the kids got dough and topped their own pizzas.