Jumping in here because we just did our Fall campout last weekend...
Our Pack does individual cook for both breakfasts and lunch, but we do a Pack dinner. A few leader volunteers organize and make the main course, and all families bring sides, desserts, tableware, drinks, to share. We collect donations at dinner time, and usually offset the cost.
Last weekend we did BBQ pork skewers, BBQ chicken, 60 lbs of potatoes baked on charcoal in foil, and fresh salad to feed 100+ people. It worked out pretty well, but there was a lot of prep/pre-cooking ahead of time by a few adults. We did 'gourmet foil packs' in the spring, which was again a lot of prep work by a few, but we made and cooked 100+ foil packs with a lot of success.
I'm thinking of deep frying a few turkeys for our Oct2013 trip, doing a 'Thanksgiving in October' (Canadian?) theme with all families helping with the sides. Giant stock pots of instant mashed potatoes, stuffing, green been casserole in dutch ovens...why not!