Sept. 9 & 23. All musicians invited to bring acoustic instruments to play bluegrass-style music. Vocalists welcome. Inclement weather cancels. Call by 3 p.m. on the day of the jam with any questions. 7–9 p.m. (doors open at 6:30 p.m.), 1320 Baldwin. $5. (734) 794–6250, a2blugrass.com.