Get your costume out for a "Truck or Treat" event, learn about soldiers and knights at an Arms & Armor demonstration, or take in a family comedy show.

Friday, October 19

Backyard and Beyond: Forest Fridays. Discovery Museum, 177 Main St., Acton. 10-10:45 a.m. Come outside and do a nature-based activity based on the weather and season, either in the Discovery Woods our out on the conservation land adjacent to the Museum. Designed for ages 2 to 6. Free with admission. Members free; nonmembers $14.50, ages under 1 free. discoveryacton.org.

Family Fun. Newton Free Library, 330 Homer St., Newton. 3-5 p.m. Drop-in for family games and activities, as we provide a space for quality time, building materials, activities, and games. Free. newtonfreelibrary.net.

Saturday, October 20 

Truck or Treat. Northborough Crossing, Routes 9 & 20, Northborough. 11 a.m.-2 p.m. dress in costume for an afternoon of fun to include a display of service vehicles and trucks; an East Coast Gaming mobile gaming truck; photo opportunities with characters including Anna and Elsa from Frozen, Superman and Batman; music by DJ Peter; trick or treating at participating merchants throughout the center; and giveaways such as candy, glow-in-the-dark necklaces and Halloween bags (while supplies last). Free. northboroughcrossing.com. 

Arms + Armor Demonstrations. Worcester Art Museum, 55 Salisbury St., Worcester. 11:30 a.m. & 2 p.m. Learn all about the different arms and armor used by Roman soldiers, Medieval knights, and beyond. Free with admission. Members free; nonmember adults, ages 4 to 17 $6, ages under 4 free. worcesterart.org.

Jurassic World: Fallen Kingdom. Newton Free Library, 330 Homer St., Newton. 2 p.m. Continue the adventure as dinosaurs are brought back to life and wreak havoc to those who cross their paths. Free. newtonfreelibrary.net.

Backyard and Beyond: Modern Survival Skills with PrimiTim. Discovery Museum, 177 Main St., Acton. 2-4 p.m. Join survivalist expert Tim ‘PrimiTim’ Swanson as you cover basic shelter building, wild edibles, water gathering, fire starting, tracking, and more. Register ahead. Free with admission. Members free; nonmembers $14.50, ages under 1 free. discoveryacton.org.

Coco. Worcester Public Library: Main Branch, 3 Salem Sq., Worcester. 2:30 p.m. Enjoy this Academy Award-winning Pixar film following a young boy who enters the Land of the Dead, and learns the joy of family, music, and love. For ages 12 and under. Free. mywpl.org.

Happier Family Comedy Show. The Eric Carle Museum of Picture Book Art, 125 West Bay Rd., Amherst. 3 p.m. Celebrate creativity during this spot-based improvisational show for the entire family to enjoy. Recommended for ages 5 to 12. Member adults $9, children $4.50; nonmember adults $10, children $5. carlemuseum.org.

So You Think You Can Dance: Live. The Hanover Theatre, 2 Southbridge St., Worcester. 8 p.m. Follow the success of the top 10 finalists comprising this year’s favorite dancers. $39.50-$100. thehanovertheatre.org.

Sunday, October 21 

Boston Area Chantey & Maritime Sing. USS Constitution Museum, Charlestown Navy Yard, Building 22, Charlestown. 2 p.m.-5 p.m. Listen, learn, and lift your voices as you participate in your Maritime Heritage by joining a rousing chorus of sea chanteys at the USS Constitution Museum. Donation Suggested. ussconstitutionmuseum.org.