Nola, a town east of Naples just off the A16 autostrada, has a long history (Roman emperor Ceasar Augustus died here) and an odd but fascinating festival of the Gigli (Lillies) each June.
From Naples, take A1 north to A16 heading towards Bari. Follow signs for Nola; once you get close, follow signs for the Centro. Parking lots at Piazza d'Armi at 40°55.7'N 14°31.8'E. Piazza del Duomo is at 40°55.56'N 14°31.65'E, but you can't drive anywhere near there. There is also a train, but it runs infrequently.
A number of Nola residents emigrated to Williamsburg, Brooklyn, where each year Our Lady of Mt. Carmel sponsors a gigli festival. Walkinginbrooklyn has a great description of the festival, along with videos. The most famous US gigli festivals are detailed at gilio-usa.org. The Sons of San Paolino also put on an event in Glen Cove, NY. The New York Folklore Society published a nice article called "Born to Giglio" about these US festivals.