New Year's Eve is observed annually on December 31, the final day of any given year in the Gregorian calendar. In modern societies, New Year's Eve is often celebrated at social gatherings, during which participants dance, eat, consume alcoholic beverages, and watch or light fireworks to mark the incoming year. Other individuals may observe the evening with a watchnight service. The observance of New Year's Eve generally extends through midnight of January 1 (New Year's Day).