The patrons of Casorate Sempione are Saint Hilary, celebrated on 13 January in the small Church of Sant'Ilario, and Saint Titus.
Every ten years, the feast is revived in an extraordinary form, now transformed into a rivalry competition among the town's districts: it lasts ten days, rich with events. The last edition was celebrated in September 2016. The town also holds the Church of the Beata Vergine Assunta and the Arco della Pace di Cristo Signore.