Nori Day, also known as Seaweed Day or Purple Laver Day, is observed in Japan every February 6. The holiday was established by the National Federation of Laver, Shellfish and Fishing Industry Cooperative Association to honor nori, a traditional food made from edible seaweed, and to encourage its consumption. The date commemorates the enactment of the Taihō Code, which mentions nori as a taxable product. Celebrations primarily occur in municipalities that produce nori and include industry and community events, such as festivals organized by fishing cooperatives and meals featuring nori in school lunches or special promotions. Nori, rich in vitamins and commonly used in various Japanese dishes like onigiri and sushi, has a history dating back to the early 8th century. The cultivation of nori began in the Edo period, and its modern sheet form was developed in the mid-18th century.