THURSDAY, MAY 23
A Butterfly’s Life — A beginner’s guide to butterflies. 7 p.m. Lafayette Public Library, 775 W. Baseline Road, Lafayette, 303-678-6214.
Gear and Skills Clinic — With Andrew Skurka. 7 p.m. Neptune Mountaineering, 633 South Broadway, Boulder, 303-499-8866.
Lucky Mile Race Series — Holiday Night. 6:30 p.m. Elm Street and County Road, Louisville, www.luckymile.com.
SATURDAY, MAY 25
Fly Fishing Classes — Level one class, free. 9 a.m. The Orvis Company, 629B S. Broadway, Boulder, 303-554-0122.
Wildflowers of Heil Valley Ranch Hike — A leisurely 1.5-mile loop through forest and meadows. 10 a.m. Meet at group picnic shelter at Heil Valley Ranch, North of Boulder off Lefthand Canyon Drive, 303-678-6214.
SUNDAY, MAY 26
Visit to the Flagstaff Fire — A strenuous all-day hike on Bear Peak. Registration required. 9 a.m. Bear Peak, Boulder, www.naturehikes.org.
MONDAY, MAY 27
BolderBoulder 10K. 7 a.m. and subsequent start times. Walnut and 30th in the Twenty Ninth Street mall, Boulder, www.bolderboulder.com.
TUESDAY, MAY 28
Bike Maintenance Basics. 6:30 p.m. REI Store, 1789 28th St., Boulder, 303-583-9970.
Dine and Dash Tuesday Evenings — With City of Boulder Parks and Recreation. 5 p.m. Boulder Reservoir, 5565 N. 51st St., Boulder, 303-413-7200.
Hiking in Switzerland. 7 p.m. Changes in Latitude Travel Store, 2525 Arapahoe Ave., Boulder, 303-786-8406.
To list your event, send information to: firstname.lastname@example.org. attn: “Adventure.”