Shabbat Services with Alan Brigish and Rabbi Brian Walt, 5:30 p.m., Martha's Vineyard Hebrew Center, 130 Center street, Vineyard Haven. Remembering Nelson Mandela: South Africans Reflect on Apartheid, Mandela and the Future of South Africa. All are welcome. Call 508-693-0745.
Free Guided Walk, 9 a.m., Caroline Tuthill Preserve, Edgartown-Vineyard Haven Road, Edgartown. Walk old and new trails. Conducted by the Sheriff's Meadow Foundation. Approximately one and a half hours. No reservations required. Call 508-693-5207 or visit sheriffsmeadow.org.
Learn About Mill Brook, 3 p.m., Public Safety Building, West Tisbury. Steve Hurley, district fisheries manager from the Mass. Division of Fisheries and Wildlife, discusses the Mill Brook Fisheries Sampling Report and water temperature monitoring.
Honoring The Photography of Peter Simon, 6:30 p.m., Pathways Gathering Space, Chilmark Tavern. Mr. Simon's iconic photographs capture historic figures, family, community and more. Covers period from 1962 to 2013. Refreshments and music by Sally Taylor and Garrett James. Call 508-645-9098.