Sunset Paddle on the Quinsigamond River in Grafton. Mass. Audubon Society Meadow Brook Conservation Center. 414 Massasoit Road. Worcester.  6:30 p.m. to 8:30 p.m. Put in at the Ekblaw Landing and paddle upstream into the wildlife-rich Snow Marsh. Ages 10 and older. Fee: $10 Adult Members, $12 Adult Non-members, $7 Child Members, $9 Child Non-members. Registration required.  508-753-6087. www.massaudubon.org