Marsh Cleanup, Nov 14, 9 am-12 pm, Spring Lake, Sewell Ave., Hamilton. 989-6540; www.state.nj.us/counties/mercer/commissions/park/

Environment Fest, Nov 14, 12-4 pm, Lawrence Township Public Library, 2751 Brunswick Pike, Lawrenceville. Free

Early Birds, Nov 16, 7 am-8:30 am, Baldpate Mountain Visitor Center, Fiddlers Creek Road, Titusville. 989-6540; www.state.nj.us/counties/mercer/commissions/park/

Trail Treks, Nov 17, 9 am-10:30 am, Curlis Lake-Mercer County Northwest Park West Windsor. 989-6540; www.state.nj.us/counties/mercer/commissions/park/

Forrest Friends, Nov 18, 1-2:30 pm, Baldpate Mountain Visitor Center, Fiddlers Creek Road, Titusville. 989-6540; www.state.nj.us/counties/mercer/commissions/park/

Young Naturalists Club, Nov 18, 3:45-5 pm, Baldpate Mountain Visitor Center, Fiddlers Creek Road, Titusville. $8 per program; $24 for the series

Backyard Buddies: Exploring nature in a backyard habitat, Nov 19, 3:45-5 pm, Roebling Park, Nature Center Trenton. $8 per program; $24 for the series 989-6540; www.state.nj.us/counties/mercer/commissions/park/

Sunday Stroll Series: Adapt, Migrate or Hibernate?, Nov 22, 10 am-11:30am, Roebling Park, Spring Lake Trenton. $3 989-6540; www.state.nj.us/counties/mercer/commissions/park/

Explore Your Parks, Nov 22, 1-3 pm, Roebling Park, 989-6540; www.state.nj.us/counties/mercer/commissions/park/

Grounds For Sculpture

Jacobo de la Serna ceramics, thru Jan 10

Albert Paley, metal sculpture, thru April 18

International Sculpture Center Exhibition, thru Jan 10

Beatlemania Now, Nov. 13, 8 pm. $25-$30

Gingerbread House Demonstration with Peter Max Dierkes, Rat’s Restaurant Pastry Chef, Nov. 14, 12 pm.

Gingerbread House Workshop, Nov. 14, 1:30 pm. Ages 10 and up. $20-$25. Register.

Holiday Style Workshop, Nov. 21, 1-2:30 pm. Ages 6-12. $10-$12.

Decorate holiday cookies, Nov 28, 1-4 pm. $5.

Holiday Music, Nov 28, 3-5 pm

Gingerbread House Awards Nov 28, 4 pm.

Holiday Lights On, Nov 28, 5 pm!

Grounds For Sculpture, 18 Fairgrounds Road, Hamilton. $6-$10. (609) 586-0616; www.groundsforsculpture.org. (wv)

Washington Crossing State Park Nature Center

Family Nature Walk (all ages) Nov 14, 1-2 pm

Shelter Building Wilderness Survival (6 yrs. - adult) Nov 15, 1:30-3 pm

Family Scavenger Hunt (all ages) Nov 22, 1:30-4 pm

Washinton Crossing State Park, Route 546, Titusville. (609) 737-0609; www.state.nj.us/dep/parksandforests/parks/washcros