A rock festival with more than 100,000 attendees occurred here on August 1-3, 1969. About three dozen of the biggest acts of the time played, including Iron Butterfly, Santana Blues Band, Jefferson Airplane, Creedence Clearwater Revival, Janis Joplin and Crosby, Stills & Nash. Don't go by the official poster as to who was there. Some acts were added, some did not appear. Joni Mitchell left the stage in tears because the crowd was not paying attention to her.