Arrrggghhh, pirates are invading Sheffield Island Lighthouse.

Children young and old will get a glimpse of pirate life when they take a round-trip ferry ride to the Norwalk Seaport Association's "Pirates Weekend," taking place over two weekends, Fridays and Saturdays, July 14 and 15, and 21 and 22, on Sheffield Island.

Once there, visitors will be greeted by pirate re-enactors who will entertain with gunfire and sword fighting demonstrations, sea chanteys, storytelling and other activities.

"Pirates Weekend" activities are free, but participants must purchase round-trip ferry tickets to Sheffield Island.

"Stories of pirates in Long Island Sound, such as the famous Captain Kidd abound, so we thought we'd bring them to life," said Irene Dixon, president of the Norwalk Seaport Association.

The Norwalk Seaport Association was founded in 1978 as a nonprofit organization dedicated to the preservation, education and public awareness of Norwalk's maritime environment and heritage.

The Association has owned, restored and maintained Sheffield Island Lighthouse since 1986 and is the official U.S. Fish & Wildlife Service Friends group for the Norwalk Islands. From May through September, visitors can board the Seaport Association's 45-foot C.J. Toth catamaran for a cruise to the island and then tour the lighthouse, observe wildlife in its natural habitat in the Stewart B. McKinney National Wildlife Refuge, hunt for shells along the beach, dine on a picnic lunch and play on the lawns around the lighthouse.

Information capsule: Sheffield Island dock, adjacent to the Stroffolino Bridge, Washington and Water streets, South Norwalk. Saturdays, Sundays, July 14 and 15, July 21 and 22, 11 a.m., 2 p.m., 3:30 p.m. Event is free; ferry tickets $22; $12 ages 4 through 12; $5 ages 3 and younger. 203-838-9444, www.seaport.org.