Santa Rosa, APRIL 18

Smart cycling: Sonoma County Bicycle Coalition’s 101 A bike safety class, 6-8:30 p.m. at 750 Mendocino Ave. A bicycle is not required for the class but bring a helmet for instruction on proper fitting. $20, $10 for coalition members. Visit bikesonoma.org for details.

Santa Rosa, APRIL 21

Kidical mass: Bicycle parade for kids and kids at heart from Franklin Park, 2095 Franklin Ave. to Courthouse Square for an Earth Day celebration. 11:30 a.m. Visit bikesonoma.org or call 707 799-3911 for information.

Glen Ellen, APRIL 21, 22

Wildfire walk: Wildfire walk along the Wolf House Trail 10 a.m.-12 p.m.Saturday at Jack London State Historic Park, 2400 London Ranch Road and a 4 to 8-mile hike on backwoods trails Sunday 10 a.m-1:30 p.m. Bring water and snacks. $15 per outing, parking extra. Limit of 15 participants per outing. Visit jacklondonpark.com for information.

Santa Rosa, APRIL 28

Day on the Green: Celebrate the earth and its bounty at a free, family-friendly festival at Montgomery Village Shopping Center from 11 a.m-4 p.m. that benefits Well Trained Horses, a nonprofit dedicated to rescuing, rehabilitating and re-homing horses. Live music, dancing, magic and fine art that celebrates the earth. Located at the intersection of Highway 12 and Farmers Lane at Sonoma Ave. 707-545-3844.