Holdem; I have worked 2 different kinds of consession events for Papa Johns. At both we sold 16" pepperoni or cheese pizza's cut in 8 slices for I believe 3.00$ a slice. At one we had ushers in the stand selling out of party hotbags, and the other we had a stand. Needless to say the ushers sold more pizza, but they also took a comission. at one event we shuttled pizza's from the store, which is effective if you are 10 minutes from the stadium or less, however for the other we brought out the "Mobile Pizza Kitchen"; a triple stack propane oven in a trailor. It was the most awesome pizza experience I have! Myself and 2 other GM's pumping 78+ pizza's an hour for 3 hours, but I digress. Your main concern will be the availiability of a quality portable oven, and your distance from the event. Good luck.