For his American picnic last week, I signed up to bring the main part of the meal (hotdogs and ketchup!) so that he could eat those without concern. Fresh fruit and veggies were also on the menu, along with several treats he skipped.
He was thrilled with his homemade s'mores at the s'more-making station, and didn't mind missing the Cracker Jack (he helped himself to another s'more instead!)
They did an adorable Uncle Sam mask craft and played American football and hopscotch.
I know from my own school days that these are the things they will remember from elementary school. But knowing the 50 Nifty United States is pretty useful, too!