• BENEFITS

FRIDAY

Habitat for Humanity Walk, walk a 3-, 5-, 10- or 20-mile course to benefit Habitat for Humanity, Cumberland Congregational Church, Cumberland Center, and First Parish Church, Yarmouth. Donation. 829-3793. 7 a.m. to 5 p.m. 

SATURDAY

Empty Bowl Supper, benefits Maine Organic Farmers and Gardeners Association’s El Salvador Sistering Committee programs, Unitarian Universalist Church, Belfast. Tickets sold at the door: $15; $35 family maximum. 568-4142. 6 p.m.

MONDAY

Bowl For Kids Sake, bowling benefits Big Brothers Big Sisters of Midcoast Maine, ALLPLaY Family Entertainment Center, Waldoboro. 832-7860. 4 to 7 p.m. Monday and Tuesday; 4 to 5 p.m. Wednesday. Through May 5. 

• SPECIAL EVENTS

TODAY

Egg-stravaganza, egg decoration and egg hunt, bring a basket or bag, for ages 2 and older; College of the Atlantic (George B. Dorr Museum of Natural History), Bar Harbor. $2/donation. 288-5395. 3 to 5 p.m.

“Forest,” interactive visual and performing arts, Maine College of Art (Institute of Contemporary Art), Portland. meca.edu. Various times today and Friday.

Laser Fest, Audio Visual Imagineering Laser System presents laser shows, some with rock music, University of Southern Maine (Southworth Planetarium), Portland. $5; reservations recommended. 780-4249. Various times today to Sunday.

“Our Barns: A History of the Barns of Maine,” illustrated talk by Don Perkins, New Gloucester Meetinghouse. 7 p.m.

FRIDAY

Earth Day Event, local musicians playing music inspired by the Earth and specials on Peak Organic beer, Local Sprouts Cooperative, Portland. Donation. 899-3529. 6 to 10 p.m.

Trivia Night, with drink specials, free munchies and prizes, Jameson Tavern, Freeport. 865-4196. 4 to 6 p.m., followed by entertainment.

“Goldilocks and the Three Bears,” musical marionette show presented by the Children’s Puppet Workshop, Mayo Street Arts, Portland. $4 children; $8 adults. 2 p.m. Friday and Saturday.

SATURDAY

Spring Bunny Special, 35-minute train ride, Maine Eastern Railroad, Rockland. $17 ages 10 and older; $9 ages 2 to 9; free for children under age 2; tickets are $2 more on day of ride. 596-6725. 11 a.m. and 12:15 p.m.; reservations recommended.

Popcorn Saturday, children’s program with Portland Stage Company’s Theater for Kids, for preschool through grade 5; River Tree Arts, Kennebunk. $5; $20 per family. 967-9120. 2 to 3 p.m.

MONDAY

“Community Building with Your Customers and Prospects: Social Media,” workshop with Joan Carney; Frontier Cafe, Cinema & Gallery, Brunswick. $5; free for Five Rivers members. 798-6964. info@fiveriversartsalliance.org. 6 p.m.

“The Crisis of Intellectual Property,” lecture by Adrian Johns, author of “Piracy: The Intellectual Property Wars from Gutenberg to Gates,” University of New England (WCHP Lecture Hall), Portland. Free. 283-0171. 5 p.m.

Music Industry & Community Night hosted by Portland Music Foundation, Bayside Bowl, Portland. Free. baysidebowl.com. 7 p.m.

“Pick or Buy, Then Dry,” learn about the wide range of fruits, veggies and herbs you can dry for later use, Windham High School. $19. 892-1819. 6:30 to 9 p.m.

TUESDAY

Port Veritas Portland Slam Team Finals, spoken word, Blue, Portland. $5. portcityblue.com. 7 to 10 p.m.

Paul D. Merrill Business Ethics Lecture: “Health Security for Working Americans: A Moral Imperative” with Michael Dukakis, University of New England (Ludcke Auditorium), Portland. Free; open to public. une.edu/lectures/merrilllecture.cfm. 4 p.m.; reception follows. 

• FILMS

FRIDAY

Image Gazer Film Festival: Benefit screening of “Moon” (2009), a Sundance Festival selection, New Surry Theatre, Blue Hill. Donation. 669-5506. 7 p.m.

SATURDAY

“Anything But Silent,” series of classic silent films, Bangor Public Library. 947-8336. Free. Noon.

Image Gazer Film Festival: Benefit film screening of “Moon” (2009) and music by Dan Chase, Kate Jones and Nick Travis; Hammond Hall, Winter Harbor. Donation. 669-5506. 7 p.m.

“Poetry” (2010), Korean drama by director Lee Chang-Dong, Strand Theatre, Rockland. Call for price: 594-0070. 5:30 p.m. Saturday; 3 p.m. Sunday.

TUESDAY

“Flix for Chix,” monthly film series of movies for women, Skidompha Library, Damariscotta. $5/donation. 563-5513. “Miss Pettigrew Lives for a Day” (2008), 7 p.m.

WEDNESDAY

“Teens through Time,” film series with teen-centric viewpoint, Portland Public Library. Free. 871-1700. 1980s: “Breakin’ ” (1984), 4:30 p.m.

“Hip Hop: Beyond Beats and Rhymes” (2006), masculinity in rap music (explicit images and language); discussion follows; Bangor Public Library. Free. 947-8336. 5:30 p.m.

“American: The Bill Hicks Story,” 2009 documentary, Space Gallery, Portland. $5 members; $7 non-members. 828-5600. 7 p.m. 

• BOOKS/AUTHORS

MONDAY

Dr. Carl Safina, author of “The View from Lazy Point: A Natural Year in an Unnatural World,” Abromson Center, University of Southern Maine, Portland. RSVP by April 22: Lorraine.Lessard@maine.gov. 5:30 p.m. reception; 6:30 p.m. talk; 7:30 p.m. book signing. 

TUESDAY

Julia Spencer-Fleming, author of “One Was a Soldier,” campus bookstore, University of Southern Maine, Portland. Free. usm.maine.edu. 6 p.m.

Language Arts Live, series of literary readings, Bates College (Chase Hall), Lewiston. Free. bates.edu. Novelist Dinaw Mengestu, 7 p.m.

WEDNESDAY

Brown Bag Lecture with Julia Spencer-Fleming, author of “One Was a Soldier,” Portland Public Library. Free; bring your own lunch. 871-1710. Noon to 1 p.m. 

• PRO SPORTS

Portland Sea Dogs, Minor League baseball, Hadlock Field, Portland. $7 to $9. portlandseadogs.com. Vs. New Britain, 6 p.m. today and Friday and 1 p.m. Saturday; vs. Binghamton, 6 p.m. Monday to Wednesday. 

• PARTICIPANT DANCE

Ballroom dancing, Maplewood Dance Center, Portland. Call for prices: 878-0584. 7 to 11 p.m. Friday, Saturday and Wednesday.

Contra Dance with Desperate Measures, Unity Church of Greater Portland, Windham. $10. 893-1233. 7:30 to 11 p.m. Friday.

Contra Dance, music by Soupbone (traditional) and live caller, Mayo Street Arts, Portland. $7. mayostreetarts.org. 7 to 10 p.m. Saturday.

Saturday Night Dance Party, American Ballroom Dance Academy, Portland. Call for cover: 671-7644. Argentine tango lesson at 6 p.m.; group lesson at 7 p.m.; dance party 8 to 11 p.m. Saturday.