 Joni Mitchell (qv) was invited to play at the festival, but didnt  perform because her manager was afraid that she would miss her  national television debut on _"Dick Cavett Show, The" (1968)_ (qv)  after he saw how bad the traffic was. She later wrote the song  "Woodstock", which was a hit for Crosby, Stills, Nash and Young.  Graham Nash (qv) was her boyfriend at the time.