The patron saint of Casatenovo is Saint George, celebrated on 23 April and the third Sunday of July, in the Church of San Giorgio.
In July, for the town's feast, residents used to organize the settimana paesana, seven days of feasting in honour of the patron: the last historical edition dates to July 1984, later revived in 2009 by the town's young people. The town also holds the Church of the Madonna della Neve and the Church of San Gaetano, as well as the Lambro Valley Park.