Castile and León Day (Día de Castilla y León) is observed in the Spanish autonomous community of Castile and León every April 23. This official holiday commemorates the Battle of Villalar, fought in 1521 during the Revolt of the Comuneros. The celebration typically begins the evening before with outdoor concerts, followed by an official ceremony at the monument to the Comuneros in Villalar, which includes wreath-laying and speeches by local politicians. Throughout the day, various festive events take place, such as political rallies, concerts, street theater, sports, and exhibitions that showcase the culture of the region. The holiday's origins trace back to the late 17th century, gaining official recognition in 1986 after a series of commemorative gatherings that began in the 1970s.