I usually have a sample of the card at the station as well a step by step written instruction to take care of the different type of learners.
I also make up kits for each person as well as having back up supplies because people do make mistakes, But by having them ask for a new one of whatever usually causes them to try to be more careful.
If you're going to collect money, have someone else responsible for it; you have enough to worry about. You'll be having to answer questions every which way.
See if you can get a helper at each table. That allows you to be able to walk around after you've given the initial instructions and gives you the liberty to oversee and troubleshoot.
Also arrange to have people help you clean up, to let them know how you want things put away.
If you can get away with utilizing stamp sets, use one part for this card and another part for another card, it will help keep your costs down.
If you are dealing with people who have never stamped before, (especially with that many people) I have gone so far as t stamp the images ahead of time and let them to the coloring. Then you don't have to worry about teaching newbies how to stamp and use a stamp-positioner.
HTH,
Debbie
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