Sept. 25–27 (different locations). Now in its 10th year, this showcase of local and regional jazz acts features a ticketed kickoff party tonight followed by free concerts Saturday and Sunday. Also, on Saturday at 2 p.m., a free jazz improv workshop aimed at teens (sign up at a2jazzfest.com). Tonight: The Jeff Pedraz Trio, an ensemble led by veteran Detroit bassist Pedraz. Followed at 6:30 p.m. by a jazz jam session. Tonight’s show includes dinner catered by Slows Bar BQ. 5 p.m., Ann Arbor Funhouse (Fri.), 207 E. Washington, Rabbit Hole (Sat.), 608 E. William, & Ravens Club (Sun.), 207 S. Main. Tickets $50 (Fri.) & free (Sat. & Sun.). Donations accepted. (734) 769–2999, a2jazzfest.com.