THURSDAY, DECEMBER 27
Nature Hike for Seniors — Includes information about the area’s history, wildlife and resource management projects. 10 a.m. – 12 p.m. Walden Ponds Wildlife Habitat, Boulder, 303-678-6214.
Snow Fun Blood Drive. 10 a.m. REI Store, 1789 28th St., Boulder, 303-583-9970.
FRIDAY, DECEMBER 28
Pastries on the Path. 8 a.m. Boulder Creek Path at 17th Street, Boulder, www.communitycycles.com.
MONDAY, DECEMBER 31
Resolution 5k — Denver’s oldest New Year’s Eve 5k run and walk. 5 p.m. Washington Park, Denver, www.resolution5k.com.
TUESDAY, JANUARY 1
3W Resolute Runner 5k — A 5k through Ralston Creek Trail, partnered with Arvada Food Bank. 8:30 a.m. 8001 Memorial Park, W. 59th Ave., Arvada, www.active.com.
Polar Plunge 2013 — The 30th anniversary of the Polar Plunge. All proceeds benefit the Alzheimer’s Association of Colorado. Registration at 10 a.m. The plunge starts at 12 p.m. Boulder Reservoir, 5565 N. 51st St., Boulder. For more information, visit www.alz.org/co.
To list your event, send information to: email@example.com. attn: “Adventure.”