The patron saints of Castelleone are Saints Philip and James, celebrated on 11 May, the anniversary of Mary's apparition to Domenica Zane.
On this date and on the second Sunday of September, a procession is held to the Sanctuary of the Beata Vergine della Misericordia. On 16 August, celebrations for Saint Roch are held in the Borgo Serio district, while the second Sunday of October brings the town fair. The town also holds the Sanctuary of the Beata Vergine del Presepe and the Church of Santa Maria in Bressanoro.