St Piran's Day is celebrated on March 5th each year in Cornwall, England. It honors Saint Piran, the patron saint of miners and tin workers, who is believed to have brought Christianity to Cornwall in the 5th century. The day is marked by various festivities, including parades, music, and traditional Cornish food. The celebration often features the flying of the Cornish flag, which is black with a white cross, symbolizing the region's identity. Many people participate in community events, such as feasts and sporting activities, to celebrate Cornish culture and heritage on this special day.