No suggestions on what to do right now, but be VERY careful about what you supplies bring and make sure you take the time at the beginning to teach them the proper way to stamp.
I just brought my stamps in for my Brownie meeting (2nd graders 7-8 years old.) I wanted them to do "thank you" notes so I brought three stamps from "Many Thanks" and some non-SU pads I didn't really care about.
The kids were so excited about the stamps. I didn't take the time to teach them to stamp (except to tell them not to mix colors) and they just went nuts...scraping the stamps across the pads, twisting and dragging the stamps on the paper, carelessly tossing the stamps back on the pad on the wood sides :shock: I was appalled (and secretly thankful that I hadn't brought in more stamps for a larger project.) Not to mention, the cards looked hideous after all this "creativity" (but hey, my Brownies had fun
)
I would plan on lots of adult supervision and maybe a "stamp and pass" format so it doesn't turn into a free for all.
Good luck - you'll need it!
Julie