Carlos Santana, Keith and Bill Graham celebrate the success of Carlos Santana's most recent Columbia release, 'Inner Secrets', March 1979
Carrie Fisher, Ringo, John Ritter. Ringo & Peter Sellers Harry Nilsson, Ringo, Elton John, Paul & Linda McCartney
I'm still waiting to hear the outtake of "Sit On It" with Lennon and Harrison overdubbed on it posthumously taken from another recording. Many people are not aware the Ralph Malph was the 5th Beatle and "he's still got it."
I'm sure it's been posted before, but from L-R: Neil Young, Graham Nash, Stephen Stills and Jimmy Page. Supposedly John Bonham is on drums and I would venture to say Tim Drummond is on the bass. I don't know what's more unsuspected, the lineup, or Neil's Rickenbacker
Potsie passed out, fell onto some coke, and spilled it. He really blew it because JL was favoring him for a partial Beatles reunion, for Allen Klein, of a "John, Pots, George and Ringo" type thing.
NOT unsuspected! It's fairly well-known that Derek/Dominoes appeared on the Cash show. In fact, none of the photos you posted qualify as "unsuspected photos of your favorite musicians together" ESPECIALLY the one with non-musician Jackie Stewart!
It's an after-show (A CSNY show) jam at some members-only club. There's some information about it in a book (that has that same photo) called Jimmy Page Tangents Within A Framework.