(CNN) Every March 17, the world suddenly looks a bit greener as people don the color to celebrate St. Patrick's Day. What is St. Patrick's Day? St. Patrick's Day is the feast day of St. Patrick, who is the patron saint of Ireland. The first St. Patrick's Day celebration in America was held in Boston in 1737. Wearing green on St. Patrick's Day is supposed to prevent you from getting pinched by a leprechaun.

Source: CNN March 17, 2019 05:48 UTC