The patron of Oggiona, one of the two hamlets making up the town of Oggiona con Santo Stefano, is Santa Maria Annunciata, celebrated on the last Sunday of May in the Church of Santa Maria Annunciata.
In one week of June, the Palio delle Contrade is held, in which the two districts of Oggiona and the two districts of Santo Stefano take part: San Vittore-Castellani, Campo Grande-Muron, Borani-Ruarit and Cantone-Bisciuina. The territory also holds the Rile Tenore Olona Park.