|San Francisco Express Times, May 22, 1968, p. 14.|
The night before circulates from Bear's journal tape, remarkably enough (shnid-22727). The poster for that night said "Rock Jam" and we know it as Tuesday Night Jam. Check the linked info file for players.
This night, the Wednesday, May 22 gig, lists no personnel. I could drool over which jazz players might have dropped in for this benefit. I don't know of any other information about this show, pending, again, a check on Rhoney Stanley's book.
See also my post glancing across the Tuesday, June 4, 1968 Tuesday Night Jam, "Strung Between Dreams and Reality" (title courtesy of the great Ralph Gleason). I think, but am not sure, that 6/4/68 is relevant to Stanley Mouse's purple pig poster (AOR 2.170).
Need to double-check. Rhoney Gissen Stanley's book covers the event in great detail.
Lehman, Godfrey. 1968. Coast Group Set Up To Keep Jazz Alive. Billboard, May 18, 1968, p. 20, via Google Books.
Stanley, Rhoney Gissen, with Tom Davis. 2013. Owsley and Me: My LSD Family. Rhinebeck, NY: Monkfish Book Publishing Company.