Parlor Jazz Babatunde Lea and Friends playing the music of John Coltrane Date: Friday, April 20 Time: 7:30 p.m. Paul Mahder Gallery, 222 Healdsburg Ave., 800-838-3006 Tickets: $25 available now  It’s the annual return of the Operation Jazz Band artists, Babatunde Lea and Friends. Throughout the previous week, they’ve been helping local secondary school children in Healdsburg understand the underpinnings of jazz in their classrooms. On this night they play