Blue Christmas Service is a Western Christian tradition that happens on or around the longest night of the year, usually December 21 the Winter Solstice. It is about comforting fellow Christians who are grieving and struggling to find joy and hope during the season.
International Solidarity Day of Azerbaijanis

International Solidarity Day of Azerbaijanis is observed annually in the Republic of Azerbaijan on December 31. It is a public holiday that commemorates the solidarity of the people of Azerbaijan, known as Azerbaijanis. The history of the day is traceable to 1989 when the border fences separating Soviet Azerbaijan and Iran were dismantled. It also commemorates the collapse of the Berlin Wall in Germany. The holiday is celebrated not only by people in Azerbaijan but also by Azerbaijanis in the diaspora.
National Father’s Day in Thailand

Thais celebrate National Father’s Day on December 5 every year. It is a national holiday in Thailand where schools and businesses are closed. This day celebrates fatherhood across the country. Thai people honor and thank their dads and father figures for the contributions that they make to their children’s lives. Small gifts or signs of appreciation are traditionally presented.