What happened on December 25 ?

Christmas Day is a Christian holiday on this day celebrating the Nativity of Jesus. It is a public holiday in many countries, including almost everywhere in the Americas, most European nations, the Philippines and most of Oceania, some African countries, the Commonwealth of Nations, and various other countries and regions. Many non-Christians, including non-theists, celebrate secular aspects of the holiday, such as decorating Christmas trees and exchanging gifts with family and friends. Some Christians celebrate Christmas on January 6, January 7, January 18, or even not at all.

British Isles - a quarter day in England, Wales, Northern Ireland, and the Republic of Ireland. (but not in Scotland)

Roman festivals - (re)birth of Sol Invictus, the winter solstice feast in the Roman Empire since 274.

Pakistan - Quaid's Day is celebrated as a national holiday in Pakistan in honour of the birth of Mohammad Ali Jinnah.