Feeding A Large Group

I haven't seen this one before. We have a church campout planned and we do food differently from most (no pot lucks). Each family will plan, buy, prepare and clean up for one meal. The rest of the meals someone else will handle. So, if you had to provide lunch or dinner (we can choose which meal we prefer) for 50 of your closest friends (I'm serious here) what would you fix? We have done spaghetti with salad, beef/chicken fajitas, bbq pulled pork, hot dogs, hamburgers, deli meat/cheese for sandwiches in the past few years. I'm looking for some new ideas. We have a large grill and several RV's (kitchens) we can use. Let's hear what you have done. Thanks for any ideas.