Triumph of the Revolution

Triumph of the Revolution (Cuba)

Public Domain Day

Public Domain Day (multiple countries)

Polar bear plunge

Polar Bear Swim Day

Russian New Year celebration

New Year's Day (Gregorian calendar)
Novy God Day (Russia)

Japanese New Year

New Year's Day (Gregorian calendar)
Japanese New Year

Jump-up Day

Jump-up Day (Montserrat)

Global Family Day

Global Family Day

Twelve Days of Christmas

The eighth of the Twelve Days of Christmas (Western Christianity)

Kwanzaa

The last day of Kwanzaa (African Americans)

January 1 (Eastern Orthodox liturgics)

Christian feast day:
January 1 (Eastern Orthodox liturgics)

World Day of Peace

Christian feast day:
Solemnity of Mary, Mother of God; and its related observances:
World Day of Peace

Fulgentius of Ruspe

Christian feast day:
Fulgentius of Ruspe

Feast of the Holy Name of Jesus

Christian feast day:
Feast of the Circumcision of Christ
Feast of the Holy Name of Jesus (Anglican Communion, Lutheran Church)

Basil of Caesarea

Christian feast day:
Basil the Great (Eastern Orthodox Church)

2026 Crans-Montana bar fire

A fire at a bar during New Year's Eve celebrations in Crans-Montana, Switzerland, kills 41 people and injures 116 others.