No door charge. Buchwald reel list said "Garcia, Bishop & Santana Jam". Probably quite well attended, as, per Gary Jackson's ledgers, bar take was $182.75 (more than twice the next night).
listing: "Datebook," San Francisco Chronicle, December 23, 1968, p. 35, billing "Jam Session with Jerry Garcia, Jack Cassady [sic] and others"
listing: "Ad Libs," San Francisco Chronicle, December 23, 1968, p. 35: "Jerry Garcia, Jack Casady, open end jam"