Spring into spring at the contra dance in Petaluma at St John’s Cram Hall. Music by Green Gates (Jon Berger, Roxanne Oliva, & Todd Silverstein) and gender-neutral calling by Alan Winston. $13 members/15 not-yet-members/20 supporters.  $8 limited income and all those brand new to contra dancing get in free — arrive at 6:00 for a newcomers’ orientation.