In December (or at the end of the year) a very wide variety of multinational festivals and holidays are celebrated around the world, whether within particular religions, cultures, or otherwise. Celebrations listed here are celebrated in at least two or more countries.  
 
Wikipedia and other global websites were used to compile this information.
 
There are many other festivals and holidays celebrated in the month of December.  The ones mentioned here are examples of our diversity as a Rotary Club and as Rotarians from around the world.
 

December

Buddhism
  • Bodhi Day8 December – Day of Enlightenment, celebrating the day that the historical Buddha (Shakyamuni or Siddhartha Gautama) experienced enlightenment (also known as Bodhi).
Christianity
  • Adventfour Sundays preceding Christmas Day
  • Saint Barbara's Day4 December – The Feast of St. Barbara is celebrated by Artilleryregiments across the Commonwealth and some western Catholic countries.
  • Krampusnacht5 December – The Feast of St. Nicholas is celebrated in parts of Europe on 6 December. In Alpine countries, Saint Nicholas has a devilish companion named Krampus who punishes the bad children the night before.
  • Saint Nicholas' Day: 6 December
  • Feast of the Immaculate Conception Day: 8 December – The day of Virgin Mary's Immaculate Conception is celebrated as a public holiday in many Catholic countries.
  • Saint Lucia's Day13 December – Church Feast Day. Saint Lucia comes as a young woman with lights and sweets.
  • Las Posadas16–24 December – procession to various family lodgings for celebration & prayer and to re-enact Mary & Joseph's journey to Bethlehem[4]
  • Longest Night: A modern Christian service to help those coping with loss, usually held on the eve of the Winter solstice.
  • Christmas Eve24 December – In many countries e.g. the German speaking countries, but also in Poland, Hungary and the Nordic countries, gift giving is on 24 December.
  • Christmas Day25 December and 7 January – celebrated by Christians and non-Christians alike.[5][6][7][8]
  • Anastasia of Sirmium feast day: 25 December
  • Twelve Days of Christmas25 December–6 January
  • Saint Stephen's Day26 December – In Germany, Poland and the Czech Republic a holiday celebrated as Second Day of Christmas.
  • Saint John the Evangelist's Day: 27 December
  • Holy Innocents' Day: 28 December
  • Saint Sylvester's Day: 31 December
Hinduism
  • Pancha Ganapati: a modern five-day Hindu festival celebrated from December 21 through 25 in honor of Ganesha.
Judaism
Secular
There are also a number of holidays, real or pretend made popular by movies, TV and parodies. This list is too long for this article.