The patron saint of Castelfranco di Sotto is Saint Severus the Martyr, celebrated on 18 November.
Since 1987, every last Sunday of May, the Palio dei barchini con le ruote is held, in which the town's districts compete: San Michele in Caprugnana (yellow-black), San Martino in Catiana (green-orange) and two other town districts. The town holds the Collegiate Church of Santi Pietro e Paolo and the Church of San Lorenzo.