I did an air show once, as a fund raiser. We expected a big turn out. The morning of the show was so foggy hardly anyone showed up. We only sold about 40 sandwiches. Disaster. Chuck has the right idea, there is a lot of questions that need to be answered before planing can start. I would consider adding somthing quicker to prepare to the menu. Like pork chops or sausage, then cook as you go. That way unsold product could be frozen uncooked. You'd only be out some buns if sales floped.
Thanks for noticing