Sept. 5 & 19. Jam session open to all musicians interested in working on jigs, reels, and waltzes to have fun, learn tunes, and develop contra dance music skills. All instruments welcome. Bring the Ruffwater Fakebook, the Portland Collection, and the Waltz Books if you have them. The band also hosts a workshop this month, Contra Play for Acoustic Musicians (Sept. 6, 7 p.m., Gretchen’s House 2340 Oak Valley Dr., $15) with the band Raven and Goose (Corwin and Grace). 3–5 p.m., Pittsfield Grange, 3337 Ann Arbor–Saline Rd. Masking optional. Free. (734) 709–8748, [email protected].