The performance video sounds pretty sweet, maybe have them perform some effects that they all do to see how different artists view the same trick for their character. Added bonus if you can listen to commentary from the people performing, almost like director commentary, but it'd be what they're thinking and trying to accomplish with each nuance or line of the effect, get us inside their head for the performances.
Not all of the commentary has to be serious instruction of what they're doing either, get a few of them in the room to watch and they can joke around in between points.