this one features the vibe of the seminar♪
I've always enjoyed doing ensemble pieces with the participants. Writing and arranging so that everyone gets their own part, and using both hands (and regions) so that no one is on stage playing one hand while the the other hand's thumb is up their butt.

Hope this gives some idea of ETAP to people who've never been, it's a really fun, friendly, positive, musical, etc, i am sure similar to all the other seminar events and organizers!