What is the name of the New Year's Eve celebration in Denmark where people traditionally smash old plates?

The Danish New Year's Eve celebration where people traditionally smash old plates is called Nytårsaften, meaning New Year's Eve.

In Denmark, some people have a custom of throwing or breaking unwanted plates and dishes against the doors of friends’ homes. A large pile of broken crockery has traditionally been interpreted as evidence that a household has many friends, although the practice is less universal than popular descriptions suggest.

Danish New Year customs also include watching the monarch’s annual speech, eating festive food, and jumping from a chair at midnight to symbolically leap into the new year. Fireworks are common, and the Danish dessert kransekage is strongly associated with celebrations.

Nytårsaften should not be confused with Juleaften, which means Christmas Eve, or Sankt Hans Aften, associated with Midsummer. The plate-smashing custom is a Danish New Year tradition, not a standard practice at every celebration.