For the performance on Wednesday evening, July 21, 1971, at which the production became the longest-running musical in Broadway (surpassing Hello, Dolly!), audience members recieved a strange nylon scarf-poster-broadsheet hybrid that listed the complete cast as well as credits for the performance.
At the end of the performance, Mayor John Lindsay walked onstage to take part in the celebration, wearing a blue suit and a red, white and blue striped tie, and said, "After my term expires in 1974, I'm going to play Tevye. If Pearl Bailey could do it for 'Hello, Dolly!' I can do it for 'Fiddler.'" (From the account in the New York Times on July 22, 1971.)
There was also a block party after the show.
At the evening performance on Saturday, June 17, 1972, following the matinee normally played on Sundays, the production surpassed Life With Father to become the longest-running show, play or musical, in Broadway history.