THURSDAY, JANUARY 24
ESPN Winter X Games 17. Buttermilk Mountain, Aspen, www.xgames.com. Through Jan. 27.
Leni Riefenstahl: Her Skiing World — With Dr. John Allen. 8 p.m. Neptune Mountaineering, 633 South Broadway, Boulder, 303-499-8866.
FRIDAY, JANUARY 25
Patagonia Trekking: Off Season Solitude. 6:30 p.m. REI Store, 1789 28th St., Boulder, 303-499-8866.
Pastries on the Path. 8 a.m. Boulder Creek Path at 17th Street, Boulder, www.communitycycles.com.
SATURDAY, JANUARY 26
Fly Tying Classes. Orvis, 629B South Broadway, Boulder, 303-554-0122.
Snowshoeing Hike with Fitness for Living. 8:30 a.m. Justice Center parking lot, 6th and Canyon, Boulder, 303-550-3491.
SUNDAY, JANUARY 27
Winter Heritage Day. 1-3 p.m. Walker Ranch Homestead, 7701 Flagstaff Mountain Road, Boulder, 303-776-8848.
TUESDAY, JANUARY 29
Running for Brews. 6 p.m. Walnut Brewery, 1123 Walnut St., Boulder, www.runningforbrews.com.
Cross-Country Skiing Basics. 6:30 p.m. REI Store, 1789 28th St., Boulder, 303-583-9970.
WEDNESDAY, JANUARY 30
Avalanche Awareness Presentation — With Friends of Berthoud Pass and the CU Backcountry Club. 7 p.m. Humanities 1B50, CU campus, www.berthoudpass.org.
Sanborn Western Camps Road Show — With camp directors Elizabeth Rundle and Mike MacDonald. 7 p.m. Neptune Mountaineering, 633 South Broadway, Boulder, 303-499-8866.
Wednesday Fun Run. 6 p.m. Boulder Running Company, 2775 Pearl St. #103, Boulder, 303-786-9255.
Winter Survival Skills. 6:30 p.m. REI Store, 1789 28th St., Boulder, 303-583-9970.
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