“Bring out your bikes!” is the clarion call from the Valley Bike Fest, a new celebration of bicycles taking place on Saturday, Aug. 17 in Woodacre. Hosted by the nonprofit Access4bikes and the Woodacre Improvement Club, the event hopes to congregate cyclists from across the county to celebrate the sport in a region widely recognized as the birthplace of mountain biking. “West Marin is a highly popular destination for biking, yet there are no celebrations…