National Oysters on the Half Shell Day and National Clams Day in USA
National Oysters on the Half Shell Day and National Clams Day in USA is held on March 31. This event in the third decade of the month March is annual. 
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Clam is a common name for several kinds of bivalve molluscs. The word is often applied only to those that are edible and live as infauna, spending most of their lives halfway buried in the sand of the seafloor or riverbeds.
Similar holidays and events, festivals and interesting facts
National Hot Chicken Day and National Turkey Neck Soup Day in USA on March 30
World Idli Day on March 30
Taco Day in Mexico on March 31 (Día del Taco);
National Jam Day in United Kingdom on March 31
National Coffee Day in China on April 1
National Soylent Green Day and National Sourdough Bread Day in USA on April 1
National Peanut Butter and Jelly Day in USA on April 2