On the eve of the last Wednesday of the preceding year, as a prelude to Nowruz, the ancient festival of Čāršanbe Suri celebrates Ātar ("fire") by performing rituals such as jumping over bonfires and lighting off firecrackers and fireworks. The Nowruz celebrations last by the end of the 13th day of the Iranian year (Farvardin 13, usually coincided with 1or 2April), celebrating the festival of Sizdebedar, during which the people traditionally go outdoors to picnic.