A mention in the "From the Music Capitals of the World" feature in Billboard, September 11, 1971, p. 22 says that "Columbia's New Riders of the Purple Sage play the Manhattan Center Ballroom, Wednesday (15) at 34th St. & 8th Ave."
Hard to know what to make of this. That particular week was a blank slate until recently, when in my searching around I discovered listings and such for the following gigs:
Friday 9/10/71, JGMS @ Harding Theater, SF (1)
Thursday 9/16/71, JGMS @ Keystone Korner, SF (2)
Friday 9/17/71 and Saturday 9/18/71, NRPS @ Friends and Relations Hall, SF (2, 3)
So while it's not impossible that JG could have gone east to play with the NRPS on 9/15/71, it seems pretty unlikely, doesn't it? I'd be grateful for thoughts and/or leads about how to figure out whether this happened. Who would have been promoting Manhattan Center gigs at that time?
(1) listing in Hayward Daily Review, September 16, 1971, p. 25.
(2) Oakland Tribune, September 15, 1971, p. 25
(3) there is also a poster IIRC.