St. Urho's Day is a fictional holiday celebrated primarily by Finnish Americans, particularly in the United States and Canada. It honors St. Urho, a legendary figure said to have saved the grape crops from a plague of locusts in Finland. The day is observed on March 16, the day before St. Patrick's Day. Festivities often include parades, wearing green and purple, and enjoying traditional Finnish foods. While it is not an official holiday, it serves as a fun way for communities to celebrate their heritage and enjoy camaraderie. The celebration highlights the blend of cultural traditions among Finnish Americans.