In the Common Calendar, the first day of the year, called New Year’s Day, is considered a special “null” day. It is distinct and separate from all months, though printed calendars will often display it in the first month of the year, Elapidaans, with a zero for the date.
Many cultures treat is as a special day when many rules are suspended or overturned, and even some laws are unenforced. In some cultures, masters wait on servants, children are allowed to stay up past their bedtimes, and victimless crimes are ignored by custom or decree.
Among the Sonaide Bri, for example, it is a gift-giving holiday honoring Déine ap Gáeth called Fayluh Déine.