 Complete the following phrase:  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 