listings: "Datebook," San Francisco Chronicle, February 24, 1969, p. 37, billing "Mickey Hart and the Heartbeats (Jerry Garcia, Phil Lesch, and Bill Sommers)" |San Francisco Examiner, February 25, 1969, p. 26 |San Francisco Chronicle, February 26, 1969, p. 50
As per JGMF comment "The Examiner of 2/25/69 p. 26 advertises the Tuesday (2/25) and Wednesday (2/26) shows, so it seems like it was a three-night engagement"