Thanks to you all, you have given me much to think about and a lot of material to follow up.

johnross mentioned Foxhollow as an insider festival. In what sense was, or is, Foxhollow "insider"/

I visited Foxhollow whilst working on a Summer Camp in 1970. Seemed like a really good festival. I think Michael Cooney played banjo and sang "Blow away the Morning Dew" amongst other songs. I still have a tape that I made on the day "Trail of tears" was another song I think sung by a group in harmony, very emotional.