We had a friend in San Diego who went to high school with John Denver and attended many parties where he sang. Sure do miss that great voice and great person.
How about acts that you saw, but wished more folks had been there?   Saw Nanci Griffith at the Old Time Cafe in SD and there were about 6 in the audience!
I booked the Berryman's for one of their first concerts in CA - lost money on that one, but they have many fans now for sure!
Saw Greg Brown at a Ground Round in Chicago, before the PHC days - very few listened, but he was great then too.
I got Mississippi John's autograph in DC in '64. I was so nervous I forgot to ask who the lady was next to him - later he introduced Elizabeth Cotton! But at least when I sing "did you shake his hand?" I always add "I did!"
Chris