- http://lostlivedead.blogspot.com/2011/10/john-kahn-live-performance-history-1972.html (general)
- http://lostlivedead.blogspot.com/2013/03/summer-1972-pierce-street-annex-san.html (Garcia with Guaraldi at Pierce Street Annex
I have nothing major to add, just a tiny listing I found for Merl to play in the City on 5/28/72:
May 28, 1972: Merl Saunders and Friends and the Flowing Stream Ensemble, S.F. Museum of Art, McAllister at Van Ness, 2-4 pm, free.
I suspect that careful work spinning through SF Chronicle listings (which has not been done, to my knowledge, for the 1971ff period which interests me) will uncover more. In the meantime, here's a random one.