Unfortunately my Professor Snape wouldn't agree to come (You know who you are.) so Dumbledore taught Potions Class. The kids really had a blast. We had a few do-overs and a couple spills but that was to be expected.
The kids were pretty good about sharing the ingredients but I made sure to have lots so kids weren't standing around waiting.
On second thought perhaps test tubes full of concentrated food coloring wasn't such a good idea.
Some kids even dared drink their potions. For that reason I only used edible ingredients. That's not to say it tasted good.
"Hermione" consulting the potion book to make Polyjuice Potion.
This is how gross they got.
Instruct the kids to dump any rejects in the toilet (and yes they did dump and start over) NOT the sink unless you happen to be a plumber.
The aftermath. I was really glad I used a plastic tablecloth.
Sadly I was so busy the day of the party that I forgot to get any good shots of the potions table beforehand. But I did take some pictures of the ingredients afterward, they are in another post. It really did look cool.