The patron saint of Grazzanise is Saint John the Baptist, celebrated on 29 August: the feast is also called «a paparara», from the custom of eating goose.
Other traditional feasts include 8 September, Our Lady of Montevergine, and 19 August, Saint Martin at Brezza. On Saint Blaise's day it is traditional to distribute blessed bread in the mother church. The town also holds the Villa Comunale «Angelo Parente».