The Trustees of Reservations will host the Cedariver Winter Festival next Sunday from 9 a.m to 2 p.m. at its local property at 161 Forest Road. The event will feature sledding, hiking along the Charles River, and hot chocolate and s’mores by the campfire. Bring your own toboggan, tube, snowshoes, or cross-country skiis, and remember to dress warmly in layers, organizers said. The free event depends on snow cover; call 508-785-0339 to confirm. The Cedariver Reservation is one of more than 100 properties, totaling more than 25,000 acres, across the state preserved by the nonprofit organization. For more information, visit www.thetrustees.org. Full story for BostonGlobe.com subscribers.