The patron of Cassina de' Pecchi is Mary Help of Christians, celebrated on 24 May in the Church of Santa Maria Ausiliatrice.
On 9 August, the town's co-patrons, Saint Fermo and Saint Agatha, are celebrated: the feast draws people from neighbouring towns to take part in the religious services in honour of the saints and to watch the fireworks display that closes the celebrations. The town holds the Church of the Natività di Maria and Villa Ripamonti, as well as the bridge over the Martesana canal.
