Per Latvala, 4x 4-track 15 ips reels of this event exist in the GD Vault (Dwork 1996, 26, h/t Deadlists).
expost: Fong-Torres (1968): Garcia, "freaky lead guitarist of the Grateful Dead, dropped by to jam with three or four friends, and the club made its usual closed night an admission-free affair".
listing: "Datebook," San Francisco Chronicle, October 28, 1968, p. 45, showing "Jerry Garcia and Friends" opening this night.
