Sixty years ago (specifically as of 8:15 PM EST) pianist David Tudor performed a program of modern music in Woodstock, NY which included the world premiere of John Cage’s 4’33.”

Also on the program was Henry Cowell’s “Banshee.” I do not know for sure if Cowell was present, but if he was both healthy and not on tour, I’m sure he was given that his music is programmed, he is listed as a patron, and he lived nearby.