Queen in 1978. Philadelphia. I believe the venue was called RFK Stadium....no longer existing. Shortly followed by Emerson, Lake and Palmer in nearby Princeton.
I think it was Santana at the University of Miami 1969. Of course it could have been Led Zepplin or Ted Nugent at Pirate's World, Hollywood Fl same year. Or maybe it was Deep Purple and Uriah Heep? Those years were quite a blur. Damn I'm old.