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Jerry Garcia and Merl Saunders
Jerry Garcia - electric guitar, vocals
Merl Saunders - keyboards, vocals
John Kahn - electric bass
Bill Kreutzmann - drums
Martin Fierro - saxophone, flute

listing: Independent-Journal [San Rafael, CA], July 12, 1974, p. 23, billing a 9 PM show
mention: "Rap-Up's Wrap-Up," Oakland Tribune, July 14, 1974, p. 2-RAP
ad: San Francisco Phoenix, August 1, 1974, p. 6
Merl Jr. said that the tape to find would be Garcia/Saunders at the Great American Music Hall on a day that Crosby, Stills and Nash had played a Day on the Green. He says that Jack Casady and Stephen Stills came over after the CSN gig and jammed with Jerry and Merl and that it was amazing. 7/14/74 fits the bill - JGMS were at GAMH, and CSN were playing a Day on the Green.
Interestingly, I found an ad from the San Francisco Phoenix which lists two shows for the date, starting at 9 p.m. and 2 a.m. Very unusual. I wonder if it was planned ahead of time that Casady and Stills would come by?
Weather
High: 71.0 °F
Low: 55.1 °F
Feels Like High: 71.0 °F
Feels Like Low: 55.1 °F
Wind Speed: 12.5 mph
Humidity: 85.4 %
Moonphase: 0.84
Clear conditions throughout the day.
Time 9:00 PM