The Woodstock Festival (a.k.a. An Aquarian Exposition: Three Days of Peace and Music, was a three-day concert (which managed to roll into a fourth day) that took place on August 15 through 18, 1969, at Max Yasgur's dairy farm in the town of Bethel just outside White Lake, New York
It was originally supposed to be a three day concert, but it was extended to an additional day. Some musicians that played were Santana, Janis Joplin, and Jimi Hendrix (just to name a few).