It’s a surf and turf kind of weekend on the Vineyard with not one but three celebrations of field and sea.

The weekend starts off with Sheepapalooza at the Farm Institute where the farm’s 58 new lambs take center stage. The daylong event features sheep shearing with Andy Rice, a shearer from Halifax, Vt., and a regular on Island farms. Fiber arts will be displayed, a herding dog will demonstrate its not-so-sheepish abilities and there will be plenty of farm-raised food, with burgers, shepherd’s pie and salad on the menu. Sheepapalooza takes place from 10 a.m. to 3 p.m., rain or shine. Admission is $5 for individuals and $10 for families.

Saturday night it’s all about the bivalves at the third annual Shellfish Extravaganza, a fundraiser for the Martha’s Vineyard Shellfish Group at the Chilmark Community Center. The night starts off with a chowder contest featuring eight Island caterers and restaurants. The Vineyard’s finest shellfish constables and shellfishermen will be behind the dollar raw bar, shucking out gems from Island waters. Dance to Johnny Hoy and the Bluefish while putting in the highest bid for silent auction items that include local art, fishing charters, chowder dishes and shellfish collectables.

All proceeds benefit the shellfish group programs, which include growing millions of hatchery-raised seed clams, oysters and scallops that are planted in Island ponds. Shellfish hatchery director Rick Karney said this year marks the first year of what they are calling bivalvification — a campaign to increase awareness about the importance of shellfish.

“We want to make everyone aware that shellfish have been an important part of the social and economic history of the Vineyard,” Mr. Karney said. “We believe they’re going to have an important role in the future. Shellfish are really important here on the Island and we need to continue to support them.”

Tickets are $25 in advance and $30 at the door, available at Martha’s Closet in Vineyard Haven and online at mvshellfishgroup.org. Doors open at 6 p.m.

On Sunday, the Martha’s Vineyard Agricultural Society hosts Lamb-o-Rama, a noonday meal of local lamb, eggs and greens. Held at the Agricultural Hall in West Tisbury, the event is $12 for adults and $7 for children.

The weekend forecast calls for spring-like weather. Baby lambs, fresh greens and briny bivalves at the Chilmark Community Center are welcome harbingers of the season.

— Remy Tumin