Martin Z. Mollusk Day is celebrated annually on the Saturday of the first full week of May, specifically observed at the ninth Street Beach in Ocean City, New Jersey. The event features the resort's mascot, Martin Z. Mollusk, who is actually a hermit crab. Participants gather to see if Martin can spot his full shadow on the beach sand, which is believed to indicate that summer will arrive a week earlier. The celebration includes the Ocean City High School Band escorting Martin to the beach, along with other mascots like Dr. Ernest Frankenstein and Shelley the Mermaid. The event has grown over the years, attracting more attendees and raising environmental awareness to keep the beach clean. It serves as a local version of Groundhog Day, fostering community spirit and tourism in the area.