Occasionally I do hear of jam sessions, keep in mind I am still new to Nashville. I know the Nashville Jazz Workshop has one jam session a month on a Sunday. Monday nights, Bourbon Street Blues and Boogie Bar has a jam I believe. Every once in a while I hear of an occasional jam session, but nothing consistent. Looking forward to meeting you.
I saw your post in the studio/live musicians group and just read your from Sioux Falls, South Dakota and that is where I am from as well. I also just moved to Nashville about 3 months ago now. Hope all is well and maybe we can grab coffee sometime. Take Care!