MILL DEMONSTRATION, SEPT. 16

Sebastopol: Step back in history and see a free demonstration of a steam-powered saw mill, 10 a.m.-3 p.m. at Sturgeon’s Mill, 2150 Green Hill Road. Dogs not allowed, hot lunches for sale. Visit sturgeonsmill.com or call 707-829-2479.

ECO-PRINT WORKSHOP, Sept. 16

Santa Rosa: Bring a picnic lunch and create a unique eco-print silk scarf or bandana 9 a.m.-2 p.m. at the Laguna de Santa Rosa Environmental Center, 900 Sanford Road. The event includes a 1-2- mile walk along Irwin Creek. $15 for materials, registration required at lagunafoundation.org.

WATER BARK, SEPT. 16

Santa Rosa: Dogs run and frolic off-leash at the Spring Lake swimming lagoon, 393 Violetti Road, 9 a.m.-5 p.m. $5 for Regional Parks members, $7 non-members plus $7 parking. SonomaCountyParks.org.

SWIFTS RETURN, SEPT. 18

Healdsburg: Join Sonoma County Regional Parks in celebrating the annual return of the Vaux’s Swifts to the Rio Lindo Adventist Academy in Healdsburg on the birds’ migration south to Mexico and Central America. Meet 6:30 p.m. at Healdsburg Veterans Memorial Beach, 13839 Old Redwood Highway then caravan to the Academy. Bring a lawn chair and binoculars and dress in layered clothing. Parking $7 for non-Regional Parks members. 707-539-2865.

MEDICINAL PLANT WALK, SEPT. 23

Glen Ellen: Learn about the potential health benefits of Chinese herbs from Peggy Schafer of the Chinese Medicinal Herb Farm and Chinese medicine practitioner Sean Fannin, 10 a.m.-noon at Quarryhill Botanical Garden, 12841 Sonoma Highway. Space is limited, registration required. $15 members, $20 non-members. 707-996-3166, quarryhillbg.org

WATERSHED HIKE, SEPT. 23

Windsor: Learn how Shiloh Ranch Regional Park is connected to the Laguna de Santa Rosa watershed during a hike in the rugged foothills of the Mayacamas Mountains 9 a.m.-12 p.m. Meet at Shiloh Ranch Regional Park, 5750 Faught Road. Parking $10. Visit lagunafoundation.org.

TOMATO, PEPPER FESTIVAL, SEPT. 23

Windsor: Taste 40 different varieties of tomatoes and salsa and taqueries from local restaurants, see a pepper display and roasted pepper demonstration and sample Mimosas and Bloody Marys at the Windsor Certified Farmers Market, 701 McClelland Drive at the Town Green 10 a.m.-1 p.m. windsorfarmersmarket.com

FARM CHORES, SEPT. 23

Petaluma: Learn about the daily care of farm animals 8:30-10:30 a.m. at Tolay Lake Regional Park, 5869 Cannon Lane. All ages welcome, registration required. 707-789-9699, SonomaCountyParks.org.