Operation Jazz Band in the Gallery Friday, April 20 Paul Mahder Gallery, 222 Healdsburg Ave. Time: 7:30 p.m. Tickets: $25 available now It’s the annual return of the Operation Jazz Band artists, Babatunde Lea and Friends, who have been helping local secondary school children in Healdsburg understand the underpinnings of jazz all week. Tonight they play for the public, an always-popular show including Azar Lawrence on tenor sax, Angela Wellman