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The Carlisle Trails Committee offers a free guided moonlight walk of the town-owned Cranberry Bog property at 7 p.m. Sunday. Participants can meet at the Bog House parking lot on Curve Street. The trek will follow the Cranberry Bog loop trails into the woods on the Pipeline Trail, then north into Chelmsford along the Peninsula Trail to Baptist Pond. A shorter route will be offered if there is interest. Bring a headlamp or flashlight and wear waterproof footwear appropriate for the conditions (possible snow, ice, mud, or standing water). Cross-country skiers or showshoers are welcome if conditions permit. Refreshments will be served afterward. Rain cancels the trip. For more information, contact Steve Tobin at email@example.com or 978-369-1680.