Hi J., I am a mom of 5 terrific kids, and 2 awesome grand daughters. I am a pro clown, and face painting is always a hit for all ages! I know you said your son has allergy problems, I use snazaroo paints, they pride themselves on being the safest for allergies. I get mine at clown antics clownantics.com. The store is actually a home of husband & wife clown team.If you let them know as soon as possible, that you need them quickly, they may let you pick them up tomorrow. It's not hard to come up with simple drawings, or let the middle schoolers do it, they love it! Hope things go well. P.S you can paint the hand, arms ect if you are worried about the face :) If you want to do more toddler games..let the mid school kids take charge of the games, this will make them feel useful,mature,and they will have fun without playing them
D.