The Pretos Velhos Festival is observed in Brazil every May 13 by followers of the Umbanda religion, commemorating the abolition of slavery in the country. This festival honors the Pretos Velhos, or Old Black Men, who are revered as good spirits representing the wisdom and compassion of old slaves who suffered during their lifetimes. The date marks the anniversary of the Golden Law (Lei Áurea), which abolished slavery in Brazil in 1888. Umbanda, a syncretic Afro-Brazilian religion that blends African beliefs with Catholicism and indigenous traditions, has around 400,000 adherents in Brazil. During the festival, mediums may incorporate the spirits of Pretos Velhos, often portraying them as kind and wise figures, which involves specific customs such as sitting down before speaking due to their perceived frailty. The festival serves as a significant cultural and spiritual observance within the Umbanda community.