The patron of Casalattico is Saint Barbatus, celebrated on 19 February, to whom the Chiesa di Santa Maria della Pace e San Barbato is dedicated.
The calendar of feasts continues with the Madonna della Pace on 29 July, in the hamlet of Montattico, the Irish Fest on 14 August and the Emigrant's Feast on 15 August; the municipality of 641 inhabitants in the province of Frosinone also holds the Monastero di Sant'Angelo in Pesco Mascolino.
