FOOD. Serving food to large groups can be difficult because the lines can get soon long. Kids get squirmy and adults get hangry. This set up allowing 4 lines to be served at once is brilliant. Source: IndulgyUse warmers and crock pots to keep the food warm. Keep things simple and serve food that can be assembled ahead of time, like hot dogs on buns.
If you’re trying to save on time, search for a budget friendly caterer. There are local restaurants as well as family run businesses worth looking into.