Andy,
I love your ideas! I think that the paper goods and disposables is a great addition, and I would be thankful if you did that again! The t-shirts are great!!! The one that you brought me last year is the nicest one that I have, and it's holding up very well! Thanks again for that!
I think that I'm going to put out a list of the things that we can use as the weeks get closer. I am going to privide potato wedges and fried chicken for staurday evening, so the rest can be pot luck (bring a dish to pass). Things like italian dressing based pasta salads and green salads and vegetables will be great in the coolers. Mayo based things like potato salad and cole slaw might not hold as well as Rosscoe said.
Lunch and breakfast items will be needed as well! I know that we already have some great breakfast breads on the way, but again, we might have as many as 100 people at the event.
As far as the #'s we have seen in the past, we usually have about 30-45 people with us for breakfast on Saturday morning. Lunch will be on your own as we will be gathering for the river run. We have had 50-60 for dinner on Saturday, and Sunday morning is down to that 30-40 again. Of course there are a great deal of more people that attend the event, but as far as the ones that are active and present in the campground, it's slightly less.
I think that the best thing to consider is for everyone to bring a variety of things that they enjoy, and try not to rely too heavily on the things like potato chips and snack food. Fresh vegetables, fruit, and those things will help to lighten the sugar and fat that we tend to eat a lot of (me included).
I'll try to send out a suggestion list in the coming weeks!