Immaculate Conception Day is a significant holiday in the Philippines that is observed every 8th of December. As a predominantly Catholic country, the Philippines pays homage to the Immaculate Conception of Mary - the belief that Mary, the mother of Jesus, was conceived without the taint of the original sin. This divine favor is said to have made her a suitable vessel to carry Jesus in her womb. The doctrine was defined as an article of faith by Pope Pius IX in 1854.

This religious holiday is marked by various festivities and rituals across the nation. Devotees often attend mass and join processions held in honor of the Virgin Mary. Churches and homes are adorned with beautiful decorations, and streets are filled with vibrant parades and lively fiestas. Further, the Immaculate Conception Day also marks the start of the extended Christmas season in the Philippines, which is known for having one of the longest Christmas celebrations globally.

One of the notable celebrations of Immaculate Conception Day is held in Manila, where the Manila Cathedral, dedicated to the Immaculate Conception, serves as the focal point for the festivities. The cathedral holds a special mass attended by thousands of devotees. Additionally, the holiday is a non-working day allowing Filipinos to observe the day fully. While it is a solemn religious holiday, it also brings families and communities together in a spirit of unity and faith.