Szent István Nap, or St. Stephen's Day, is a national holiday in Hungary celebrated on August 20th. It honors King Stephen I, the first king of Hungary, who played a crucial role in establishing the Christian state in the year 1000. The day is marked by various festivities, including parades, fireworks, and traditional food. The holiday also commemorates the founding of the Hungarian state and the significance of the Holy Right Hand of King Stephen, which is a revered relic. Many people attend church services, and the day serves as a reminder of Hungary's rich history and cultural heritage.