The Festa de Nossa Senhora da Guia is the largest religious and cultural event in Mangaratiba, celebrated in September in honor of the municipality's patron saint. Five days of programming include a maritime procession with the saint's statue on an adorned boat, a solemn mass, an auction, a church fair, musical performances, a food court with typical caiçara cuisine, and craft stalls. The festival attracts thousands of faithful and tourists from across the Costa Verde. It is an immersion into the faith and culture of the Fluminense coast, with a centennial tradition.