Since Charley Noble mentions it...I wasn't in Michigan in the 1960s (I'm there now) but some of the almost-famous folks from there and then are Chuck Mitchell (Joni's ex), Ron Coden (still around, still performing and a neighbor of mine) and Phil Marcus Esser (not sure where he is).
The Raven Gallery was a premier folk venue in Southfield, a Detorit suburb. It's been a very good restaurant, Sweet Lorraine's, for many years.