smackbringer,
You know, I’ve only ever done one (this was in the runup to the Anatomy Reviews, I was trying to shake off some rust and see if I could still draw anything, lol)
and it was really cool! I’d love to do more, I did this one in conjunction with some really nice folks at ArtDC.org, and it was a blast. Even bought like 14 flimsy wood fold~up easels for the event, lol! 
I’d like to try to do something like that more, but it’s hard to get space, etc. Models are less of a problem, as there is the local Figure Drawing Guild, and ArtDC can help me with hiring models (we had 2 the day of the workshop). Roberto was there, as well as Ines and LoTekk, Thalaxis, and a few other locals I know thru CGTalk. What I’d really like to do is teach full~time, but of course it takes time to get that kind of position, and I haven’t yet finished my MFA. But yep, after the CGWorkshop, I’d like to try to organize another local workshop. 
Cheers,
~Rebeccak