I can’t give you direct feedback as I am only an Aspiring Sea Monkey. But I love Artemis, and it would be top on my list of things to do on JCCC5 should I manage to make up my mind to go in time to get a reasonably-priced room. I would both watch the celebrities play as well as playing myself at the designated times. I would also likely come equipped to run my own spontaneous mini-sessions (laptop for mainscreen/server, several old Galaxy s4s/tablets to loan out).
I expect the things you can potentially improve would be technical, including setup well in advance to work out bugs such as mainscreen viewability, sound levels, connectivity, etc. I also like the suggestion to have the least drunk/most experienced group go first as a demo for those who follow. The amount of training you describe sounds right, while people need to be oriented, they are also on a semi-vacation and we want them to have a good time, too.