Short answers, pulled from the story.
The holiday falls on the 14th of January in the Gregorian calendar during the 20th and 21st centuries. This date results from a thirteen-day drift between the Julian calendar and the solar year that developed over time.
People gather outside their houses to start huge bonfires while neighbors drink and eat together around the flames. Those who stay at home eat homemade pita with a coin hidden inside the dough, and whoever finds the coin is said to have luck during the coming year.
Russia celebrates both calendars by observing the 1st of January as a public holiday alongside the 14th of January festivities. The Julian calendar celebration serves as a nostalgic family holiday that ends the broader New Year cycle including Eastern Orthodox Christmas on the 7th of January.
Berber communities in North Africa celebrate Yannayer based on their traditional calendar which aligns closely with the Julian system. Tamil-speaking lands observe Thai Pongal on the same day when the sun begins moving northward after its southward journey.
Most Welsh communities considered the 1st of January to be Dydd Calan before the Calendar Act legally adopted changes in England and Wales. Local children travel from house to house singing traditional Welsh language songs to collect calennig while Scotland marks the eve of the Old New Year on the 12th of January with The Burning o' the Clavie ritual in Burghead.