With Young on board, the restructured group embarked on a four-leg, 39-date tour that ended with three European concerts in January 1970. Their first major public gig was on August 16, 1969, at the Auditorium Theatre in Chicago, with Joni Mitchell as their opening act. They mentioned they were going to someplace called Woodstock the next day, but that they had no idea where that was. Their one-hour show at the Woodstock Festival in the early morning of August 18, 1969, was a baptism by fire. The crowd of industry friends looking on from offstage was intimidating and prompted Stills to say, "This is the second time we've ever played in front of people, man. We're scared shitless." Their appearance at the festival and in the subsequent movie "Woodstock," along with recording the Joni Mitchell song memorializing Woodstock, boosted the visibility of the quartet. CSNY appeared at other prominent festivals that year. Footage from two performances from the Big Sur Folk Festival (held on the grounds of the Esalen Institute on September 13–14, 1969) appears in the movie "Celebration at Big Sur". They also appeared at the violence-plagued Altamont Free Concert on December 6, 1969, alongside Santana, Jefferson Airplane, The Flying Burrito Brothers and the headlining Rolling Stones. At the band's request, their performance was not included in the subsequent film "Gimme Shelter" (1970).