Possible Jerry Gig? October 15-16, 1971, Keystone Korner, SF, CA

So, here's one that caught my eye. Nick the Greek, Merl, Tom Fogerty, Dave Getz (presumably) and John Kahn gigging at the Keystone Korner on a Friday-Saturday night in October, 1971 when Jerry is not known (to me) to have been otherwise occupied. Jerry and Merl were billed at the same place the weekend before.

Makes one wonder, doesn't it?