The patron saint of Formello is Saint Lawrence, celebrated on 10 August.
In the days around the feast, a salute of fireworks is fired, a ritual procession is held on 9 August, along with a thoroughbred horse race and an equestrian gymkhana, closing with a fireworks display. The town holds the Parco di Veio and the Church of San Michele Arcangelo, as well as the Oratory of the Nativity.