Parlor Jazz at Paul Mahder Gallery Dayna Stephens and Billy Childs – Duo Performance Date: Saturday, October 7 Time: 7:30 p.m. Tickets: $25 available now  Paul Mahder Gallery, 222 Healdsburg Ave., 800-838-3006 This is a rare opportunity to hear these two amazing musicians in a duo concert. Dayna Stephens is not a stranger to Healdsburg, but Billy Childs will be performing here for the first time. Stephens and Childs both