HONK! Festival, various locations, Cambridge and Somerville. A festival of activist brass street bands featuring several days of performances, dance parties, processions and a lantern parade. Through Oct. 9. FREE. honkfest.org.
Peabody Museum 150th Anniversary, noon to 4pm, Peabody Museum of Archaeology & Ethnology, 11 Divinity Ave., Cambridge. Enjoy birthday cake and live music and view some treasures rarely on exhibit. FREE. 617-496-1027; peabody.harvard.edu.
Beach Ramble, 10am, Allens Pond Wildlife Sanctuary, 1280 Horseneck Road, Westport. Explore many different habitats and their inhabitants on a short nature walk. FREE. 508-636-2437; massaudubon.org.
Harvest Festival, 11am – 3pm, Verrill Farm, 11 Wheeler Road, Concord. An old fashioned fair with a petting zoo, pony rides, carnival games, music, hayrides and more. Benefits Emerson Hospital. FREE. 978-369-4494; verrillfarm.com.
Fall Open House, 10am – 5pm, Museum of Fine Arts, 465 Huntington Ave., Boston. The museum opens its doors to the public on this day of gallery browsing, musical performances, art making and family tours. FREE. 617-267-9300; mfa.org.
Family Fun Day, 10am – 2pm, The Stevens-Coolidge Place, 137 Andover St., North Andover. Play lawn games, make crafts or go on a fall nature scavenger hunt. FREE. 978-356-4351; ttor.org.
Indigenous Peoples’ Day, 9am – 4pm, Rocky Woods, Medfield. Take a peaceful hike and search for pieces of information about local Native people throughout your walk. Kids adventure backpacks available. FREE. 978-356-4351; ttor.org.
Columbus Day, noon to 5pm, The Old Manse, 269 Monument St., Concord. Drop in for tours of the historic Old Manse, living history demonstrations, kids’ activities and live music. FREE for MA residents. 978-369-3909; ttor.org.
Peek a Blue Hike, 11am, Houghton’s Pond, 840 Hillside St., Milton. Join the Friends of the Blue Hills for their bi-weekly baby and toddler hiking series. Snacks and drinks provided. FREE. 781-828-1805; friendsofthebluehills.org/peekablue.
Pumpkin Carving, 4-7pm, Oak Knoll Wildlife Sanctuary, 1417 Park St., Attleboro. Help carve pumpkins for Saturday’s Spooktacular at Attleboro Springs. Bring your own pumpkin. Registration required. FREE. 508-223-3060; massaudubon.org.
Boston Book Festival, times 10am – 6pm, Copley Square, Boston. Readings and book-related activities for the whole family. FREE. 617-945-9552; bostonbookfest.org.
Wildlife Habitats, 10am, Habitat Education Center, 10 Juniper Road, Belmont. Survey and monitor nest boxes and other wildlife habitats. Registration required. FREE. 617-489-5050; massaudubon.org.
Fall Foliage Sunset Hike, 4:30pm, Blue Hills Ski Area, 4001 Washington St., Canton. Take in the season’s finest colors from the region’s highest hill. Picnic at the top, then hike down by the lights of the ski area. FREE. 781-828-1805; friendsofthebluehills.org.
Harvest Fair, 10am – 5pm, Newton Center Green, Newton. A community festival with kids amusement rides and activities. FREE. 617-796-1540; newtoncommunitypride.org.
musiConnects, 2-4pm, Boston Nature Center, 500 Walk Hill St., Mattapan. Enjoy a concert and connect with nature on a trail walk. Registration required. FREE. 617-983-8500; massaudubon.org.
Harvest Fair, 10am – 5pm, Newton Center Green, Newton. Food trucks, rides, pumpkin decorating, a Green Expo and hundreds of vendors mark the second day of this community festival. FREE. 617-796-1540; newtoncommunitypride.org.
Family Concert and Food Allergy Expo, 1:30-3pm, Needham High School, 609 Webster St., Needham. Kyle Dine, songwriter, performer and food allergy educator, headlines this special event. FREE. 781-444-7778; asthmaandallergies.org.