The Desert Bluegrass Association hosts free jam sessions at the following times and locations: From 4 to 6 p.m., Wednesday, March 23, at 17th Street Market (840 E. 17th St., 792-2588). From 4 to 6 p.m., Sunday, March 27, at Thirsty's Neighborhood Grill (2422 N. Pantano Road; 885-6585). Free. Visit desertbluegrass.org, or call for more information.