The patron of Casapesenna is Saint Helena the Empress, celebrated from 14 to 18 August.
The traditional feast includes, besides the procession, folk music concerts, fairground rides, food stalls and a final fireworks display. On the second week of September, Saint Anthony of Padua is also celebrated, while on 2 July, in the locality of Isola, the feast of the Madonna delle Grazie is held. The town also holds the Church of Santa Croce.