[1] First known performance [2] Only known performance (by JGMS) and first time played by any act next known performance on 1975-02-28 by LOM [3] First known performance (by JGMS) last known performance on 1974-12-28 by LOM
This material circulates as 7/21/74, but this is the correct dating. The only memo in the history of the Institute for Jerry Garcia Studies establishes this beyond any reasonable doubt - what one of us calls ε. GD Archives had receipts showing that Betty bought a bunch of tape at Morrison's in Bereley this date. See "Financial: RR: Purchase Orders, 1975-1976" Grateful Dead Archive, Special Collections, UC Santa Cruz, MS.332.ser. 2, box 73, folder 8.
All the billings and tapes say Jerry Garcia and Merl Saunders, but this is one where reversing the order could be justified, as this is some flavor of Aunt Monk / Merl Saunders Band.