This Sunday, June 29, Tisbury Waterways Inc. sponsors an evening of seafood and cocktails at Denys and Marilyn Wortman’s home at 231 Hines Point, Vineyard Haven, from 5:30 to 7:30 pm. Special guest speakers include Martha’s Vineyard Shellfish Group director Rick Karney, Tisbury Shellfish Constable Danielle Ewart, and M.V. Shellfish Group’s Emma Green-Beach on how oysters can help keep Island ponds clean. Admission is $45. RSVP to firstname.lastname@example.org.