Notes
Bob Schwartz, who attended the show the next night, reports "I was in SF at this time and I am pretty sure this show didn’t happen." He was from Florida, knew Vassar, and so has a lot of credibility. Correspondingly, we now list this show as uncertain. At the same time, on the 7/21/73 rehearsal, Vassar mentions doing a tune in G "last night". So maybe they practiced instead of playing live?
Listing: San Francisco Chronicle, July 20, 1973, p. 50
Preview: “Jerry Garcia’s Bluegrass Group to Play at Keystone,” Oakland Times, July 17, 1973, p. unk
Ad: Berkeley Barb, July 19-August 1, 1973, p. 21, listing band members and "special bluegrass fiddler from Nashville" Vassar Clements.
Listing: Hayward Daily Review, July 20, 1973, p. 44, billing "surprise".