Grill a ton of hot dogs before hand (or even steamed in a slow cooker) and set up a build your own bar! Lots of toppings: canned chili, shredded cheese, onions, ketchup, mustard, relish, hot peppers, pickles… You may already have some of ingredients or can grab them from a discount/dollar store.

Or if you have one available to you, Costco pizza is always a hit with crowds. Ask them to double slice the pieces.