It's called Christmas Eve (at night). But if you wanted to know what it was called in the day, I would just say Christmas Eve Day. Otherwise, I don't really know. I hoped this helped.
Christmas Eve
Advent
Eve means "before" and naturally Christmas Eve is the day before Christmas.
the Monday before Christmas
Because eve means before and Christmas is the next day so Christams eve means the day before Christmas.
The eve, is the day before May day Same as Christmas eve is the day before Christmas day.
It is called Little Christmas Eve. In Norway, the holiday is called Lille Julaften and begins the actual celebration part of Christmas (December 23 and 24) rather than the Christmas Eve/Christmas celebrations in other countries.
Technically, there's an eve of any day, since it just means the day before. I've heard mention of a tradition called Tipp's Eve, which is basically a family celebration on the day before Christmas Eve.
The day after Christmas in Canada is called Boxing Day.
In Australia, Christmas Day is called Christmas Day, just as it is in other English-speaking countries around the world. It is preceded by Christmas Eve.
It is called Little Christmas Eve. In Norway, the holiday is called Lille Julaften and begins the actual celebration part of Christmas (December 23 and 24) rather than the Christmas Eve/Christmas celebrations in other countries.
Any day with "Eve" in it means "The evening before the day of the event". Therefore, it's not technically Christmas Eve until the evening of December 24, the evening before Christmas Day (Dec. 25).