Avándaro. The Festival de Avándaro was a historic Mexican rock festival held on September 11–12, 1971, on the shores of Lake Avándaro in a hamlet called Tenantongo, near the town of Valle de Bravo in the central State of Mexico. The festival took place at the height of La Onda and celebrated life, youth, ecology, music, peace and free love. Has been compared to the American Woodstock festival. A milestone in the history of Mexican rock music, the festival was estimated to have drawn from 100,000 to 250,000 concertgoers. Originally to present 12 bands due to the massive number of attendees a total of 18 acts performed outdoors during the sometimes rainy weekend. Woodstock. The Woodstock Festival was a music festival attracting an audience of over 400,000 people, scheduled over three days on a farm in New York state from August 15 to 17, 1969, but ultimately ran four days long, ending August 18. During the sometimes rainy weekend, 32 acts performed outdoors before an incredible audience. It is widely regarded as a pivotal moment in popular music history, as well as the definitive nexus for the larger counterculture generation. In tune with the idealistic hopes of the 1960s, in Woodstock was a sense of social harmony, which, with the quality of music, and the overwhelming mass of people, behavior, and attitudes, helped to make it one of the enduring events of the century. Rolling Stone listed it as one of the 50 Moments That Changed the History of Rock and Roll.