According to former NRPS publicist (Michelle McFee): Buddy Cage recalls (his memory isn't the best) that he first sat in during some Bay Area NRPS gigs in early Nov. 1971. (including 11/6 & 11/7)
The plan was for Garcia and him to both sit in on pedal steel during the next tour, beginning 11/11/71 in Atlanta. Garcia's plane was late so Cage did the set without him and everyone was OK with it and Garcia never played pedal steel with NRPS again. (Garcia plays banjo on 3/18/73) FWIW: Cage was on pedal steel at the 12/5/71 show, my first. My friend Todd Brown saw the 11/15/71 show and remembers Cage on pedal steel as well. Marc