Sept. 19 is recognized by rock historians as the anniversary of one of music's biggest festivals and as a crucial day in the fight for free speech in music lyrics. Keep reading to discover more about these and other notable events that took place on this day in rock history. Notable Recordings and PerformancesTwo massive concerts took place on Sept. 19:1970: The first Glastonbury Festival, then known as the Pilton Pop, Folk & Blues Festival, took place. The first Glastonbury Festival, then known as the Pilton Pop, Folk & Blues Festival, took place. English rock band T. Rex headlined.