Stephen, someone drew my attention to the 2/11/70 Show at Fillmore the other day, because several members of Fleetwood Mac and the Allman Bros. were in for a jam... did you happen to make that show? I'm curious about who was in on it. I figured Peter Green, maybe Jeremy Spencer at that time.
From reading several accounts & watching a few videos (different edits, I think), I would say that at one time or another you hear J. Garcia, B. Weir (who seems to have stepped out early; maybe as soon as Duane came on), P. Lesh, M. Hart, B. Kreutzmann, P. Pen, D. Allman, G. Allman, B. Oakley, B. Trucks, P. Green, D. Kirwan, J. Spencer, M. Fleetwood, and A. Lee. (Mick & Arthur just on percussion; Butch took over Mickey's kit, and Mickey switched to hand percussion).
Peter (