Chelmsford Winterfest is to kick off at 5:30 p.m. Feb. 3, with what is being billed as an outdoor “Friday Night Lights.” Join the Chelmsford Open Space Stewards and the New England Mountain Bike Association at the main parking lot of Russell Mill Soccer Fields to explore more than 6 miles of snowshoe trails on the 120 acres of town conservation land that stretches along Russell Mill Pond. Groups will be broken up by ability, from slow, enjoyable walks to a trek that will challenge even the best athletes. Hot chocolate and light snacks will be waiting in the parking lot when groups return. Bring your own snowshoes and a night headlamp. For more information and a detailed schedule of other Winterfest activities, visit chelmsfordlibrary.org/winterfest.