Old info: "An eyewitness, in a letter written 25 years later to an Oregon newspaper, reports that the New Riders and Country Joe McDonald may have played also."
Account by Suzie L on dead.net entry for the show "Also playing at this festival were Taj Mahal and a pre celebrity New Riders of the Purple Sage. My information comes from an old handbill and my husband's memory, he was the bass player for Sand, at that time."