Christmas
Advent: four Sundays preceding Christmas Day
Saint Barbara's Day: 4 December – The Feast of St. Barbara is celebrated by Artillery regiments across the Commonwealth and some western Catholic countries.
Krampusnacht: 5 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 Day: 13 December – Church Feast Day. Saint Lucia comes as a young woman with lights and sweets.
Las Posadas: 16–24 December – procession to various family lodgings for celebration & prayer and to re-enact Mary & Joseph's journey to Bethlehem
Longest Night: A modern Christian service to help those coping with loss, usually held on the eve of the Winter solstice.
Nikoljdan: 19. December - the most common slava, St. Nicholas's feast day.
Christmas Eve: 24 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 Day: 25 December and 7 January – celebrated by Christians and non-Christians alike.[5][6][7]
Anastasia of Sirmium feast day: 25 December
Twelve Days of Christmas: 25 December–6 January
Saint Stephen's Day: 26 December – In Germany, Poland, the Czech Republic and Ireland 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