Things to do with kids in the Boston area this week

1 PM – 4 PM·Bookmobile · Waltham

Toe Jam Puppet Band performs twice, with trick‑or‑treating around the Bookmobile and library, plus crafts, at the Annual Halloween Party, all ages.

4 PM – 6 PM·Williams School, 180 Walnut Street, Chelsea, MA

Halloween cookie decorating, dance party, Monster fishing, Pin the Boo on the Ghost, penny pitching and more at Williams School, with a $5 registration fee, for ages 3–10.

11 AM – 1 PM·Louis Pasteur Park in Beachmont · Revere

Free pumpkins for the first 50, pumpkin decorating, games, activities and snacks at Louis Pasteur Park, optional costumes, for ages 3–13.

11:30 AM·Waltham

Costumed Halloween run on the Western Greenway trails, starting at the McLaughlin Building, with a free Kids' Monster Dash at 11:30 am and a 5K at noon, ages 3–13.

1 PM – 3 PM·Assembly Row · Somerville

Trick-or-Treat for a Cause offers candy, surprises, and Halloween beats across Assembly Row businesses, with donation drop‑off on The Lawn for the Somerville Homeless Coalition.

10 AM – 12 PM·deCordova Sculpture Park and Museum, 51 Sandy Pond Road, Lincoln, MA 01773

Halloween in the Morning Mist is held at deCordova Sculpture Park and Museum.

3 PM·Wellesley

Cider and donuts served at Cronk's Rocky Woodland, with a tour of the Hansel & Gretel cottage and information on WCLT’s restoration work; costumes and leashed dogs welcome.

2 PM – 5 PM·Somerville High School, 81 Highland Ave, Somerville

Latin American and Caribbean Heritage Celebration (Somerville High School) — Food from Brazilian cheese bread to Haitian griot, capoeira, Bolivian folk dance, samba lessons, and DJ sets fill free afternoon.

3:30 PM – 5 PM·South Boston, courtyard, South Boston

Halloween playdate and costume party in the South Boston Library courtyard offers treats, music, and crafts; costumes encouraged, all ages.

10:30 AM – 11:15 AM·South Boston, program room, South Boston

Fall-themed music and movement session with Stacey Peasley at South Boston program room, featuring energetic beats, catchy melodies, and interactive play for children five and under.

7 PM – 8 PM·Putterham — Meeting Room - Putterham · Brookline

Owl Night with Mass Audubon (Putterham Meeting Room, Brookline) — Up‑close owl encounter with animal ambassadors, educator‑led Q&A, and owl‑related biofacts exhibit, ages 3 and up.

10 AM – 11:45 AM·Keys Community Room · Milton

Halloween-themed concert with Franc Graham kicks off the jamboree in lower-level Keys Community Room, followed by trick‑or‑treating and a craft in Story Hour Room, for ages 3–12.

5 PM – 7:30 PM·Grove Hall, Dorchester · Boston

Costume contest, spooky photo booth, crafts, candy, and music fill Grove Hall’s annual HALL‑oween party for all ages.

6:30 PM – 8 PM·Large Meeting Room, Cary Memorial Library, 1874 Massachusetts Avenue, Lexington, MA, 02420

Slightly scary stories and creepy Halloween crafts in the Large Meeting Room, supplies and instructions provided, staff on hand, all ages, children under 8 need adult.

6 PM – 6:45 PM·Polonia Park, 37 Trement Street, Chelsea, MA

Grand Reopening of Polonia Park (Polonia Park, Chelsea) — Modern playground equipment, fenced dog park, shaded picnic area, splash pad, new seating, and fresh trees and plantings.

4 PM – 5 PM·West End, Boston

Esther Gomez leads a Día de Muertos celebration at West End, guiding participants in building an ofrenda, wearing monarch wings, and sharing Pan de Muerto for all ages.

10:30 AM – 11:30 AM·East Boston, East Boston

Costume-clad toddlers dance to Halloween music in East Boston, ages 0–5.

10:30 AM – 11:30 AM·Roslindale, Roslindale · Boston

City Ballet of Boston performs jazzy‑ballet excerpts from Ben’s Trumpet, followed by a book reading and dance lesson from a teaching artist, for ages 3–8.

4 PM – 5 PM·Codman Square, Dorchester · Boston

Explore real Massachusetts animal bones and pet giant bugs at Codman Square, Dorchester; limited to 25 participants, reserve by phone or email, for ages 6–12.

5 PM – 9 PM·Harvard Museum of Natural History, 26 Oxford St, Cambridge, MA

Halloween adventure at Harvard Museum of Natural History includes trick-or-treating galleries, photo booth, costume-inspired nature displays, rare specimen encounters, and a free raffle.

11 AM – 12 PM·Lower Mills, This event will be held inside the library community room., Dorchester · Boston

Tom Knight’s Halloween puppet show in Lower Mills library community room features Freddy the Troll, hand‑made puppets, musical numbers and audience participation, all ages.

7 PM – 10 PM·Chelsea Square, Chelsea, MA 02150

Outdoor screening of animated classic Coco on Chelsea Recreation & Cultural Affairs' giant 9 × 16′ LED screen at Chelsea Square; bring a blanket or chair.

6 PM – 8 PM·Broad Discovery Center, 415 Main Street, Cambridge

Free after‑hours museum night at Broad Discovery Center features a Bluetooth outbreak simulation, interactive displays, DJ Backspin and Operation Outbreak, recommended for middle school ages and above.

4 PM – 7 PM·Chelsea Square, 179 Winnisimmet Street

Trunk or Treat in Chelsea Square offers trick-or-treating, entertainment, and activities with free candy, open to all ages.

3 PM·Malden

A Trick or Treat Treasure Map is handed out at City Hall Plaza, directing participants to candy spots around the square, for ages 12 and under.

10:30 AM – 12:30 PM·Central Library in Copley Square, McKim Exhibition Hall, Boston

Costume showcase, family music dancing, cozy book nook reading, and autumnal activities in the McKim Exhibition Hall for ages 0-5.

5 PM – 8 PM·Discovery Museum · Acton

Sensory‑Friendly Halloween at Discovery Museum.