The correct answer to this open question is the following.
The Festival of Woodstock represented counterculture beliefs in that this important festival organized in 1969 was a spontaneous expression of the American youth that wanted to rebel from the status quo. Thousands of young Americans attended this iconic festival in Woodstock, New York, to express themselves in ways that could not be expressed in conventional society. They listened to folk and rock music, they had dr*gs, they had s*x, and these were ways to show a counterculture against the establishment. Famous rock bands such as The Who, Santana, Janis Joplin, Canned Heat, and Creedence Clearwater Revival participated in the festival.