In reply to Bob Kemp:
Thanks for the link. Above is link to Isle of Wight Festival to which the article refers. At one point in the JM performance a man looking like the picture of Cary Raditz in the article seizes hold of the microphone and shouts about "Desolation Row." It turns out this didn't refer to the Dylan song but to a ramshackle collection of tents where people who had crashed the festival were living. He was huckled off the stage by security guards. Apparently this guy was known as "Yogi Joe" because he had taught Joni Mitchell yoga in Crete. Suggests to me that this was Cary Raditz.
If you haven't seen this I would recommend a watch. JM is looking radiant in a yellow dress and in fine voice despite all the distractions.