THURSDAY, August 29
Hike for Seniors. 10 a.m. Caribou Ranch Open Space, Boulder, 303-678-6214.
Luke Mehall: Climbing Out of Bed. 7 p.m. Neptune Mountaineering, 633 South Broadway, Boulder, 303-499-8866.
SATURDAY, August 31
Boulder Sunset Tri/Du/Run. Boulder Reservoir, 5565 N. 51st St., Boulder, www.yourcausesports.org.
Coal Creek Crossing — 5K, 10-mile and kids fun run. 7 a.m. Louisville Community Park, 955 Bella Vista Drive, Louisville, www.coalcreekcrossing.org.
Obstacle Mania — 12-16 obstacles in race. 9 a.m. Greenbriar Inn, 8735 N. Foothills Hwy., Boulder, www.mettlemania.com.
Symphony in Stone — A 2.5-mile hike in the area that inspired Jeffrey Nytch’s First Symphony “Formations.” 12:30 p.m. Walter Orr Roberts Trailhead, north side of NCAR, Boulder, www.naturehikes.org.
Splash Dash Boulder County. 6 a.m. Sandstone Ranch Community Park, 2525 E. Ken Pratt Blvd., Longmont, www.splashdash5K.com.
MONDAY, September 2
Dog Days of Summer — Open swim for dogs. 4-6 p.m. LaMont Does Outdoor Pool, 500 S. Boulder Road, Lafayette, www.cityoflafayette.com.
Hometown Fair Family 5K Fun Run. Boulder Public Library, 1001 Arapahoe Ave., Boulder, www.bceproductions.com.
TUESDAY, September 3
Packing Light Clinic. 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.”