It's a great idea (clearly).
Panel: how will this not devolve into mass chaos, with everybody posing and emoting and talking over each other? Whispers / asides can be noisy as well, so how to divide up / pair up / effectively ensure everybody gets personal attention?
Participants:Would a character not on the 'teaching panel' be given free reign to pose/emote/test things out? Because that'd be the first expectation I'd have....and if not, then there is a chance of disappointment / feeling of wasted time.
Timeline: If there is a structured sequence that builds upon things and characters are trying to join up 'late' or leave & then return to the forum, repeats of old stuff might be necessary. Or they might just be lost and then have to read the workshop in text later.
Opportunity cost: assuming these would be given during high-traffic time slots, there is an IC opportunity cost in terms of players advancing plots. Maybe worth it, maybe not.
Repeatability: since this need will still be around down the line, how can it be structured so that it is easily repeatable / sustainable at a desired frequency?
Possible solution: isn't this why we have the tutorials? Couldn't there just be a scripted 'workshop' that individuals go through, and then maybe they get spit out at the end into an OOC-area where they can test things out, maybe there is an NPC there or player characters can volunteer their time?
Looking forward to your thoughts. I am probably just overthinking things.