Saw him 6 April 1968 (two days after the assassination of Martin Luther King) at Scarsdale Junior High School (Scarsdale's a well-to-do suburb of New York City). Saw him a couple of other times, but I don't have the dates. Always enjoyed his shows, still sing and play the music. I sang "What's That I Hear?" as an unaccompanied duet with my daughter at the (Australian) National Folk Festival about 5 years ago.