St. Rupert's Day is celebrated on September 24th in honor of Saint Rupert, the patron saint of Salzburg, Austria. He is known for founding the city and establishing the Salzburg Cathedral. The day commemorates his contributions to the region and the spread of Christianity. Festivities often include religious services, processions, and cultural events that highlight local traditions. Many people participate in community gatherings, enjoying food and music that reflect the heritage of Salzburg. St. Rupert's Day serves as a reminder of the city's history and the enduring influence of its patron saint.