Friday, June 21 

Officer Leo Storytime and Meet & Greet. Leominster Public Library, 30 West St., Leominster. 10-10:30 a.m. Meet local police officer Leonardo Colon, as he reads a story and answers any questions you may have about his job. Recommended for ages 3 to 6. Register ahead. Free. leominsterlibrary.org.

Backyard and Beyond: Forest Fridays. Discovery Museum, 177 Main St., Acton. 10-10:45 a.m. Enjoy a nature-based activity corresponded to the weather and season outside, and explore the outdoors through our Discovery Woods or on the adjacent conservation land. Recommended for ages 2 to 6. Free with admission. Members free; nonmembers $14.50, ages under 1 free. discoveryacton.org. 

Open Book, Open Play. The Eric Carle Museum, 125 West Bay Rd., Amherst. 10:30-11:30 a.m. Enjoy an interactive story-time followed by time to move, play, and explore materials. Recommended for ages 2-6. Free with admission. Adults $9, youths $6, ages under 1 free. carlemuseum.org.

Backyard and Beyond: Nature Journaling. Discovery Museum, 177 Main St., Acton. 2-3 p.m. Explore the natural world taking in the signs of the season by making your own nature journals and take them out on a walk through our adjacent conservation land. Free with admission. Members free; nonmembers $14.50, ages under 1 free. discoveryacton.org.

Family Fun. Newton Free Library, 330 Homer St., Newton. 3-4:30 p.m. Drop-in for provide games, building materials, and other activities for all ages and families to enjoy. Free. newtonfreelibrary.net.

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

Think Like an Archaeologist. Discovery Museum, 177 Main St., Acton. 5-7:30 p.m. Put on your archaeologist’s thinking cap and try some simple activities that archaeologists use in the field to learn the history of the people and places around them. Free. discoveryacton.org.

Summer Solstice Celebration. Harvard Museums of Science and Culture, 11 Divinity Ave., Cambridge. 5-9 p.m. Celebrate the longest day of the year and mark the beginning of the summer season through flower-crown making, sun-inspired crafts, and festive learning. Free. hmnh.harvard.edu.

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Saturday, June 22 

Hubbardston Fair. Curtis Recreation Field, Gardner Rd., Hubbardston. 10 a.m.-4 p.m. The third annual fair will feature a variety of vendors and food trucks, activities for all ages, and live music all day. Free. https://www.facebook.com/events/1058492531018583/

Boston Pickle Fair. Seaport, One Design Center Place, Boston. 10 a.m.-5 p.m. This is a big dill, celebrating all things pickle. Sample pickles, enjoy live entertainment and a home pickling competition. $20, kids under 5 free. bostonpicklefair.com.

Mr. Liam & Friends. The Eric Carle Museum, 125 West Bay Rd., Amherst. 11 a.m. Mr. Liam & Friends present an energetic show filled with drums, ukulele, puppets, and comedy featuring old favorites and silly parodies. $5. carlemuseum.org.

Backyard and Beyond: Backyard ‘Campout.’ Discovery Museum, 177 Main St., Acton. 11 a.m.-1 p.m. Celebrate National Wildlife Federation’s Great American Backyard Campout Day and try out some classic campout activities and learn some basics for a fun and successful campout. Free with admission. Members free; nonmembers $14.50, ages under 1 free. discoveryacton.org.

Kitchen Ka-Boom. Berkshire Museum, 39 South St., Pittsfield. 11 a.m.-12 p.m. Be a kitchen scientist with cool, hands-on, kid-safe experiments using ingredients found in most pantries. Registration requested. Free with admission. Members free; nonmember adults $13, youths 4-17 $6, ages under 4 free. berkshiremuseum.org.

New England Whale Festival. Marina Bay, Quincy. 11 a.m.- 4 p.m. Exhibits promoting marine conservation and boater education, with onsite marine mammal scientists, kid's activities, free boat rides, and the debut of life-sized North Atlantic right whale, Delilah. Free. us.whales.org.

Arms + Armor Demonstrations. Worcester Art Museum, 55 Salisbury St., Worcester. 11:30 a.m. & 2 p.m. Join this interactive program to learn about the arms and armor used by Roman soldiers, Medieval knights, and more. Free with admission. Members free; nonmember adults $16, ages 4-17 $6, ages under 4 free. worcesterart.org.

Family Fun Fest. Leicester Town Common, Washburn Sq., Leicester. 12-4 p.m. Food, face painting, live music, kids' games, live animal show and more. Free.  https://www.facebook.com/events/337131966986263/

How to Train Your Dragon: The Hidden World. Newton Free Library, 330 Homer St., Newton. 2 p.m. Join Hiccup the Viking Dragon Trainer as he enters a hidden dragon utopia. Free. newtonfreelibrary.net.

Summer Solstice Concert & Celebration. Museum of Russian Icons, 203 Union St., Clinton. 2-4:30 p.m. Featuring the music of Bach, Prokofiev, and Albeniz, this special solo cello concert will inspire all. Members $25-30; nonmembers $30-35; at-door $40. museumofrussianicons.org.

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Sunday, June 23 

Special Sunday in the Studio. The Eric Carle Museum, 125 West Bay Rd., Amherst. 12-5 p.m. Explore new materials and try a different project during this special artful exploration. Free with admission. Adults $9, youths $6, ages under 1 free. carlemuseum.org.

Boston Portuguese Festival. Boston City Hall Plaza, 1 City Hall Sq., Boston. 2-8 p.m. Celebrate the sounds, culture and folk traditions of Portugal and Portuguese Americans during this outdoor celebration to kick-off the summer. Free. bostonportuguesefestival.org.