This week

Safe boating course, Flowery Branch. Learn about boating safety, how to handle boating emergencies and navigate waterways. 8:30 a.m. to 4:30 p.m. Saturday, Coast Guard Auxiliary Operations Center, 6595 Lights Ferry Road, Flowery Branch. Class size limited. 770-904-6340 or auxiliaryclass@bellsouth.net.

Bike ride, Cumming. Moderate, more than 41 miles. Chicken City Cyclists. 10 a.m. Saturday, Concord Church, 6905 Concord Road, Cumming. unnoldl@charter.net.

Camellias/Air Layering Propagation class, Gainesville. Del Mixon. Hall County Master Gardeners. 1 p.m. Wednesday, Gardens on Green, 711 Green St., Gainesville. Free.  

Upcoming

Stars Over Elachee at Chicopee Lake, Gainesville. Learn about astronomy and how to use a telescope to view the night sky. For adults and children age 8 and older. Bring a flashlight and pencil. Reservations required. 7:30-9 p.m. March 20 and 21 and 7:45-9:45 p.m. April 18, Elachee Nature Science Center, 2125 Elachee Drive, Gainesville. $10 adults, $5 children age 2-12, free for Elachee members. 770-535-1976 or www.elachee.org.

Special Trillium Trek Training Clinics. Learn about orienteering, nature facts and first aid. Learn more about the trek. 10 a.m.-1 p.m. March 20 and 27, April 17 and 24, Elachee Nature Science Center, 2125 Elachee Drive, Gainesville. Call to register. 770-535-1976 or www.elachee.org.

Ongoing

Triathlon Club, Gainesville. No experience necessary. Meets 7 p.m. second Tuesdays, Fit 2 Tri Store, 1292 Thompson Bridge Road, Gainesville. 770-712-9129 or fit2tri@gmail.com.

ISI Cycling ride, Gainesville. 35-45 mile ride. No ride in rain or temperature less than 36 degrees. 1 p.m. Sundays, Kroger Shopping Center, 3630 Thompson Bridge Road, Gainesville. 678-231-0417.