Greg Gaar lists these photos as being from 1975-06-17, but our friend Volkmar has pointed out that Garcia played the Wolf at that show. And they would not be from 1975-12-19 as other photos from the 19th show Bobby in a plaid shits (Greg's set shows him in a solid colored shirt). So we assume they are from this gig.
listing: Hayward Daily Review, December 20, 1975, p. 4
review: Alston and Dym 1976
review: Coddington 1975: liked JGB and KF, but found KDB lackluster. He mentions Tutt.