THURSDAY, August 22
Being Caribou — A feature-length documentary on a husband-and-wife team that follows a herd of caribou across the Arctic tundra. 7 p.m. Neptune Mountaineering, 633 South Broadway, Boulder, 303-499-8866.
FRIDAY, August 23
Sunset Hike on Bald Mountain. 6:30 p.m. Bald Mountain, Sunshine Canyon Drive, Boulder, 303-678-6214.
SATURDAY, August 24
Coyote Chase 5K. 8 a.m. Monarch High School, 328 Campus Drive, Louisville, www.active.com.
Learn to Stand Up Paddleboard Class — With REI. 9 a.m. and 12:30 p.m. Boulder Reservoir, 5565 N. 51st St., Boulder, www.rei.com.
Living in Lion and Bear Country — Moderate 1.5-mile hike with a naturalist. 9 a.m. Lichen Loop Trail at Heil Valley Ranch, Lyons, 303-678-6214.
Maintaining and Upgrading Your Road Bike. 9 a.m. Community Cycles, 2805 Wilderness Pl., Ste. 1000, Boulder, 720-565-6019.
Redline 13.1 Erie — Inaugural half marathon and 10K. 6 a.m. Lehigh Park in Erie Commons, 751 Eichhorn Drive, Erie, www.redlinerunningcompany.com.
SUNDAY, August 25
Heart & Sole Half Marathon & 10K. 6:30 a.m. Boulder Reservoir, 5565 N. 51st St., Boulder, www.heartandsolehalf.com.
MONDAY, August 26
Newcomers’ Hike to a Flatiron. 5:30 p.m. Chautauqua Ranger Cottage, 900 Baseline Road, www.naturehikes.org.
To list your event, send information to: email@example.com. attn: “Adventure.”