 Trevi also has some light industry and food processing other than olive oil.The patron saint of Trevi is St. Emiliano; his feast is celebrated on January 27 with a night-time procession of the "Illuminata", in which his statue is carried out of the Duomo around the city along the line of the earliest medieval walls.Shrove Tuesday sees a public celebration in the main piazza, and August a 3‑week-long music festival; but the main annual festivals take place in October