Baguio City Day, observed in Baguio, Cordillera Administrative Region, Philippines, is celebrated every September 1 to commemorate the city's conversion from a municipality to a city on September 1, 1909. Known as the "Summer Capital of the Philippines" and the "City of Pines," Baguio is a first-class highly urbanized city recognized for its cool climate and lush pine forests. The indigenous name for the area was Kafagway, which was later renamed Baguio, derived from the Ibaloi word for moss. The city has a rich history, including its establishment by American colonial authorities and its role during World War II as an open city occupied by Japanese forces. Following the war, Baguio emerged as a prime tourist destination and became the seat of government for the Cordillera Administrative Region in 1987. The day serves as a reminder of the city's historical significance and resilience, particularly after the devastation caused by the 1990 Luzon earthquake.