The Day of the First National Government is observed in Argentina every May 25, commemorating the May Revolution of 1810 and the establishment of the country's first patriotic government, known as the Primera Junta. This public holiday marks the events that began on May 18, 1810, in Buenos Aires, leading to the deposition of Viceroy Baltasar Hidalgo de Cisneros and the formation of a local provisional government on May 25. Initially, the Primera Junta included only representatives from Buenos Aires, with delegates from other provinces incorporated later in December 1810. The holiday has been celebrated since its first anniversary in 1811 and is one of Argentina's two national holidays, alongside Independence Day on July 9. Major celebrations take place in Buenos Aires, the capital and largest city, and the event gained significant attention during the Argentina Bicentennial celebrations in 2010, becoming the most attended public event in the city's history.