National Clams on the Half Shell Day is observed worldwide every March 31, celebrating the enjoyment of clams, a type of bivalve mollusk. Seafood lovers indulge in clams, which can be served raw or cooked, with the half shell method preserving their natural juices. The day encourages dining at seafood restaurants or preparing clams at home, often accompanied by lemon and sauces. A popular dish associated with this celebration is clams casino, which originated in Rhode Island and features hard clams topped with breadcrumbs and bacon. Another dish, clams oreganata, is an Italian-American favorite often served during the Feast of the Seven Fishes. This day provides a perfect opportunity for enthusiasts to gather, share meals, and learn about shucking clams.