I will just make a few notes about this as extracted from Slick's account. I'll focus especially on personnel, what they played, location, and date.
Personnel:
- Jerry Garcia: electric guitar;
- Bill Kreutzmann: drums;
- ?Peter Albin?: bass;
- ... joined by ...
- Jerry Slick: drums;
- Darby Slick: guitar.
Performance:
- "we all started to jam the blues, almost the only music we could launch into with no more discussion than 'It's in "A".'"
- ca. 45 minutes
Location:
- Mission District
- in a loft
- Slick parked three blocks away, across the driveway of a cement company
- MJB coffee plant nearby
Date: I have no idea; a Friday night ca. 1966.
I don't know much about Slick, but he certainly writes glowingly of this night and of Jerry: "There was magic in the room that night, and though I have played in many jam sessions over the years, that is the one I remember with the most love, the most respect. ... I was left with a conviction that Jerry Garcia is a man of great spirit."
REFERENCE:
(1) Slick, Darby. 1991. Don't You Want Somebody to Love: Reflections on the San Francisco Sound. Berkeley: SLG Books. {pdf of chapter 5}