Here’s Greg Douglass - L-(guitarist for Steve Miller and many others, and co-writer on Miller’s “Jungle Love”) and Peter Rowan -R-on mandolin jamming away. The guy in the middle looks like Harpo Marx but if I remember correctly, was an inventor of some sort.
This was taken at an event sponsored by E&O Mari (maker of fantastic LaBella strings) in Newburg, NY in 1982 I think. I was fortunate enough to endorse their strings which I found to be fantastic. Thanks Richard Cocco!