San Pedro Cityhood Day (Araw ng Pagkalungsod ng San Pedro) is observed in San Pedro, Laguna, Philippines, on December 29 each year. This special non-working holiday commemorates the day when San Pedro transitioned from a municipality to a city, a change that occurred on December 29, 2013. The area has a rich history, having been founded as San Pedro de Tunásan in 1725, named after the patron saint Saint Peter and the local plant tunás. Over the years, San Pedro evolved from an agricultural community into a commercial and industrial hub, particularly benefiting from the industrialization of the Manila region after the Philippines gained independence from Spain. The day serves as a reminder of the city's growth and development, reflecting its historical significance and cultural heritage.