St. Stephen's Day is celebrated on December 26th, the day after Christmas. It honors Saint Stephen, the first Christian martyr, who was stoned to death for his beliefs. This day is recognized in many countries, particularly in Ireland, where it is known as Wren Day and involves various local traditions. In some cultures, St. Stephen's Day is a public holiday, allowing families to gather and enjoy festive meals together. In Hungary, it is a day for family gatherings and enjoying traditional foods, while in Italy, it is often marked by outdoor activities and concerts.