Friday, August 23

Free Fun Friday. Sponsored by the Highland Street Foundation, take advantage of free admission to the following: The Institute of Contemporary Art; Berkshire Museum; Boston Athenaeum; Buttonwood Park Zoo; Emily Dickinson Museum; Fort Devens Museum; Freedom Trail Foundation; Heritage Museums & Gardens; Museum of African American History; The Mary Baker Eddy Library & Mapparium. Hours vary.

Backyard and Beyond: Forest Fridays. Discovery Museum, 177 Main St., Acton. 10-10:45 a.m. Take part in a nature-based activity while enjoying the weather of the season in the Discovery Woods or adjacent conservation land. Recommended for ages 2 to 6. Free with admission. Members free; nonmembers $14.50, ages under 1 free. discoveryacton.org.

Pop-Up Adventure Playground. Discovery Museum, 177 Main St., Acton. 1-3 p.m. Enjoy cardboard, ropes, pulleys, art supplies, and more as you call the shots at our Pop-Up Adventure Playground. Free with admission. Members free; nonmembers $14.50, ages under 1 free. discoveryacton.org.

Outdoor Family Fun. Newton Free Library, 330 Homer St., Newton. 3-4:30 p.m. A session of family games, building materials, and other activities for friends, parents, and children to enjoy together. Free. newtonfreelibrary.net.

Summer Friday Nights Free. Discovery Museum, 177 Main St., Acton. 4:30-8 p.m. Enjoy sweet treats and explore the museum for free. Food donations for Open Table of Concord and Maynard and the Acton Food Pantry accepted. Free. discoveryacton.org.

Free Family Movie Night. Nikitas Field, 27 Franklin Rd., Fitchburg. Dusk. Bring a blanket or chair and some snacks and watch The Incredibles under the stars. Movie starts at dusk, approx 7:30 p.m. Free. facebook.com. 

Astronomy After Hours. Museum of Science, 1 Science Park, Boston. 8:30-10:30 p.m. A free evening full of astronomy-themed fun. Hands-on space science activities and telescopes available and the opportunity to view the evening’s featured astronomical object through the 11” Schmidt-Cassegrain telescope in the Museum’s Gilliland Observatory. Free. facebook.com. 

****

Saturday, August 24 

Holden Days. Main St., Holden. 9 a.m.-3 p.m. This annual community event features great food, live music, vendor marketplace, arts, craft corner, and a kids court with family dance parties, a roaming railroad, face painting, games and more. Free. wachusettareachamber.org. 

Hearts for Hooves. Klem's, 117 West Main St., Spencer. 9 a.m.-3 p.m. Live music, pony rides, craft vendors, food truck and family fun to benefit Blessings Farm. Free. facebook.com. 

Antique & Classic Boat Festival. Hawthorne Cove Marina, Salem. 10 a.m.-7 p.m. Get a glimpse at a wonderful variety of rare vintage motor yachts and sailboats from 1900-1960s. Meet skippers and crews and vote for your favorite boats. Children get to make their own wee boat, and all can board real ones. Boat rides, crafts market, artists, old-time band music, the Blessing of the Fleet and more. $5 per person; children under 12 free. boatfestival.org. 

Let's Get Local. Brookfield Orchards, 12 Lincoln Rd., North Brookfield. 11 a.m.-4 p.m. Join local farmers, breweries and wineries at this family-friendly BBQ with live music, wagon rides, corn hole, cider donuts and more. Free, but $20 ticket required for BBQ. facebook.com.

Spencer Street Party. 40 Wall St., Spencer. 11 a.m.-6 p.m. A downtown celebration with live music and dancer performances, art exhibits, food vendors, crafters, kids' activities and more. Free. facebook.com. 

Clustertruck Food Festival. Kalon Farms, 33 Seven Bridge Rd., Lancaster. 12-6 p.m. Dig in! More than 20 food trucks roll into the fields for an evening of food, fun, and live music. $10, children under 12 free. theclustertruck.com.

Bird Language with ‘PrimiTim.’ Discovery Museum, 177 Main St., Acton. 1-3 p.m. Join Tim ‘PrimiTim’ Swanson to walk through the neighboring conservation land and learn to decode some of the bird language that fills the air. Free with admission. Members free; nonmembers $14.50, ages under 1 free. discoveryacton.org.

Muppets From Space. Newton Free Library, 330 Homer St., Newton. 2 p.m. Gonzo the Great finds his family in this outrageously funny, family flick bringing all the Muppets back to the screen where they belong. Free. newtonfreelibrary.net.

Family Film Festival: Hotel Transylvania 3. Prudential Center, 800 Boylston St., Boston. 6 p.m. Enjoy entertainment, children’s activities, giveaways, and this animated adventure as your favorite monster family embarks on a luxury monster cruise ship. Free. prudentialcenter.com.

****

Sunday, August 25

Antique & Classic Boat Festival. Hawthorne Cove Marina, Salem. 11 a.m.-3 p.m. Get a glimpse at a wonderful variety of rare vintage motor yachts and sailboats from 1900-1960s. Meet skippers and crews and vote for your favorite boats. Children get to make their own wee boat, and all can board real ones. Boat rides, crafts market, artists, old-time band music, the Blessing of the Fleet and more. $5 per person; children under 12 free. boatfestival.org. 

Everyday Engineering: Strike a Balance. Discovery Museum, 177 Main St., Acton. 11 a.m.-2 p.m. Build a tabletop seesaw using rulers, paint stirrers and paper towel tools, pile on pennies, and try balancing a bird on your fingertip. Free with admission. Members free; nonmembers $14.50, ages under 1 free. discoveryacton.org.

Italian Festival. Southbridge Italian Club, 20 North St., Southbridge. 12 p.m. An Italian dinner served up with raffles, games, live music, and more. Tickets $25, kids under 10 are free. facebook.com. 

MAKEmobile. deCordova Sculpture Park & Museum, 51 Sandy Pond Rd., Lincoln. 1-3 p.m. Take your imagination for a spin with activities that explore artistic and material processes through amusing prompts and challenges. Free with admission. Members free; nonmember adults $14, ages 12 and under free. deCordova.org.