Greggory Brandt, center, artistic director of Saint Vincent Summer Theatre, and the cast of Harvey, the show that opened the theatre’s 50th season, celebrated after the performance on May 25 by cutting a cake decorated with the anniversary logo and serving it to all of the patrons at that evening’s cabaret. The show, which was performed during the theatre’s first season in 1969, was presented in honor of the late Father Tom Devereux, O.S.B., founder of the theatre.