Beach Clean Up to celebrate Earth Day is from 10 a.m. to noon, hosted by the Vineyard Conservation Society. Choose between 23 beaches to help clean up; a full list available at vineyardconservation.org. After party is from noon to 2 p.m. at the Harbor View Hotel. Scottish Bakehouse treats.
Book Launch: Martha's Vineyard, selected images from museum's extensive photograph collection, 5:30 p.m., Martha's Vineyard Museum, 59 School street, Edgartown. Books available for signing and purchase. Donations appreciated. Call 508-627-4441.
Museum: Mother's Day Cameo Cards event for children ages 5 and up, Martha's Vineyard Museum, 59 School street, Edgartown. Part of Pink and Green Weekend. Kids make cards for mom. Free. Call 508-627-4441.
The Fabulists with Vineyard Playhouse actors and writers performing fun new scripts for children, 10 a.m., Tisbury Amphitheater at the Tashmoo Overlook, Vineyard Haven. Tickets $10 for adults, $5 for children, available at the door. Cash or check only. Call 508-696-6450.
Shakespeare Out-of-Doors presents The Three Musketeers, 5 p.m., Tisbury Amphitheater, State Road, Vineyard Haven. Directed by Scott Barrow. Tickets available at the door, cash only. Performances canceled in the event of thunderstorm or downpour at show time. Call 508-693-6450 or visit vineyardplayhouse.org.
Candidate Forum in Aquinnah, 7 p.m., Old Town Hall. Sponsored by the League of Women Voters of Martha's Vineyard. Opportunity to hear statements from those running for office and ask questions on topics of interest.
Auditions: Three Musketeers, 11 a.m. to 2 p.m., Katharine Cornell Theatre, Spring street, Vineyard Haven. Come prepared to perform a short monologue from any play. Show runs July and August. Call 508-696-6450 or email firstname.lastname@example.org.
Horseshoe Crab Survey volunteer training, 9 to 11 a.m., Felix Neck Wildlife Sanctuary, Edgartown. Become a citizen scientist and learn how to count breeding horseshoe crabs and their nests. Free. Call 508-627-4850, extension 101.