The patron saint of Mombercelli is Saint Blaise, celebrated on 3 February in the Church of San Biagio.
In the hamlet of Piana, patronal festivities are instead held the second weekend of July. On 15 August, the Assumption procession takes place: celebrations begin on the evening of 14 August in the meadow before the Sanctuary of the Madonna di Fontanabuona, with the traditional concert, and continue the following afternoon with the solemn Mass. The town also holds the Castello di Mombercelli and the Church of Cristo Redentore.
