Bike power! Bikes for sale, new bike trails, a guided ride and even bike-themed earrings can be found at the second annual Northern California Bicycle Expo. Add in food, brew, live music and fun kids’ activities, and you have it all. Show up at 8:30am to mingle on the guided 10-mile ride, or come later for the rest of the activities. Five bands play, the Whiskeydrome is in effect, the Imaginists perform and more. Bike over to Santa Rosa City Hall, Saturday, Aug. 20. Free. Ride, 8:30–10am; Expo, 10am–4pm. 707.545.0153.