Saint Patrick's Day: 17 March – the fixed date to honor Saint Patrick has sometimes been moved by Church if it coincides with Holy Week, but the secular world generally always celebrates it on 17 March.
Maithil: occurring in April, Joor-seetal First day of Mithila calendar
Hexennacht: 30 April – A TST Satanic occasion solemnly honoring those who fell victim to superstition and pseudoscience, whether by witch hunt, Satanic panic, or other injustices.
South and Southeast Asian
Traditional New Year: 14 April (Usually between 12 and 14 April. Date is reckoned based on sun's entry into the constellation Aries) – In many South and Southeast Asian cultures the festival is based on harvesting of crops and a new beginning marked by the sun's entry into the constellation Aries.
Unveiling Day: 25 July – A TST Satanic celebration of religious plurality and shedding archaic superstition; celebrated on the date upon which The Satanic Temple's Baphomet statue was unveiled in 2015, an icon of modern Satanism created with "respect for diversity and religious minorities" in mind.
Halloween: 31 October – also known as Allhalloween, All Hallows' Eve, or All Saints' Eve, is a celebration observed in many countries on 31 October, the eve of the Western Christian feast of All Hallows' Day.
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.
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. The magic of Christmas Eve is in the air. This the December global holiday Frosty snow gently falls from the sky, and you can see your breath when you exhale. It's Christmas Eve—one of the most beautiful evenings of the year.
Kathika Deepam: 6 December is a festival of lights that is observed mainly by Hindu Tamils, and also by adherents in the regions of Kerala, Andhra Pradesh, Telangana, Karnataka, and Sri Lanka. Celebrated in Tamilakam since the ancient period, the festival is held on the full moon day of the Kartika (கார்த்திகை) month, called the Kartika Pournami, falling on the Gregorian months of November or December. It is marked on the day the full moon is in conjunction with the constellation of Kartika.
Pancha Ganapati: a modern five-day Hindu festival celebrated from 21 through 25 December in honor of Ganesha.
Mōdraniht: or Mothers' Night, the Saxon winter solstice festival.
Saturnalia: 17–23 December – An ancient Roman winter solstice festival in honor of the deity Saturn, held on 17 December of the Julian calendar and expanded with festivities through to 23 December. Celebrated with sacrifice, a public banquet, followed by private gift-giving, continual partying, and a carnival.
Koliada: Slavic winter festival celebrated on late December with parades and singers who visit houses and receive gifts.
Wassailia winter celebration that lands on the first full moon of December. Celebrations include gift giving and feasts.
Yalda: 21 December – The turning point, Winter Solstice. As the longest night of the year and the beginning of the lengthening of days, Shabe Yaldā or Shabe Chelle is an Iranian festival celebrating the victory of light and goodness over darkness and evil. Shabe yalda means 'birthday eve.' According to Persian mythology, Mithra was born at dawn on 22 December to a virgin mother. He symbolizes light, truth, goodness, strength, and friendship. Herodotus reports that this was the most important holiday of the year for contemporary Persians. In modern times Persians celebrate Yalda by staying up late or all night, a practice known as Shab Chera meaning 'night gazing'. Fruits and nuts are eaten, especially pomegranates and watermelons, whose red color invokes the crimson hues of dawn and symbolize Mithra.
Sol Invictus: 25 December – A TST Satanic celebration of being unconquered by superstition and consistent in the pursuit and sharing of knowledge.
Newtonmas: 25 December – As an alternative to celebrating the religious holiday Christmas, some atheists and skeptics have chosen to celebrate 25 December as Newtonmas, due to it being Isaac Newton's birthday on the old style date.
Erastide: In David Eddings' Belgariad and Malloreon series, Erastide is a celebration of the day on which the Seven Gods created the world. Greetings ("Joyous Erastide") and gifts are exchanged, and feasts are held.
Feast of Winter Veil: 15 December–2 January – A holiday in World of Warcraft. This holiday is based on Christmas. Cities are decorated with lights and a tree with presents. Special quests, items and snowballs are available to players during this time. The character of "Greatfather Winter", who is modeled after Santa Claus, appears.Germanic tribes used to celebrate the Winter Solstice as a time to be thankful for the blessings given to them to survive harsh winters. The term "Weil", incorrectly translated to "veil", means abundance in German.
Feast of Alvis: in the TV series Sealab 2021. "Believer, you have forgotten the true meaning of Alvis Day. Neither is it ham, nor pomp. Nay, the true meaning of Alvis day is drinking. Drinking and revenge."–Alvis
Decemberween: 25 December – a parody of Christmas that features gift-giving, carol-singing and decorated trees. The fact that it takes place on 25 December, the same day as Christmas, has been presented as just a coincidence, and it has been stated that Decemberween traditionally takes place "55 days after Halloween". The holiday has been featured in the Homestar Runner series.
Wintersday, the end-of-the-year celebration in the fictional universe of the Guild Wars franchise, starts every year mid December and ends the next year on early January.
IES Competition Time, Don's Event questions on the number of trips he took all over the world and in return offering prizes for the person who can guess closest. Follows this up with everyone's favourite Andrew Award presentation.
Winter's Crest: the winter celebration held on the continent of Tal'Dorei in the world of Exandria, as featured in the RPG show Critical Role.
Snowdown: A celebration observed in Runetera, The world in which League of Legends is set. During snowdown, starting in December and ending in January "Frost-chilled days give way to colder nights, but the warmth of Snowdown calls together kindred spirits and foes alike." During this time, winter game modes, winter cosmetic map changes, and new Snowdown skins are released, as well as the previous years' Snowdown skins being made available again.
Life Day: Wookiee celebration of life, featured in the Star Wars Holiday Special, in which Wookiees gather with family, wear long red robes, sing under sacred The Tree of Life and reminisce.
The Dawning: A celebration of the Light of the Traveler, and a time to spread cheer and give gifts to help keep The Darkness at bay during the long days of the winter months. Celebrated in the Destiny franchise of video games.
The following festivals have no fixed date in the Gregorian calendar, and may be aligned with moon cycles or other calendars.
Sadeh: A mid-winter feast to honor fire and to "defeat the forces of darkness, frost and cold". Sadé or Sada is an ancient Iranian tradition celebrated 50 days before Nowruz. Sadeh in Persian means "hundred" and refers to one hundred days and nights left to the beginning of the new year celebrated at the first day of spring on 21 March each year. Sadeh is a midwinter festival that was celebrated with grandeur and magnificence in ancient Iran. It was a festivity to honor fire and to defeat the forces of darkness, frost, and cold.
Chahar Shanbeh Suri: Festival of Fire, Last Wednesday of the Iranian Calendar year. It marks the importance of the light over the darkness, and arrival of spring and revival of nature. Chahārshanbe–Sūri (Persian: چهارشنبهسوری), pronounced Chārshanbe–Sūri (Persian: چارشنبهسوری) is the ancient Iranian festival dating at least back to 1700 BCE of the early Zoroastrian era. The festival of fire is a prelude to the ancient Norouz festival, which marks the arrival of spring and revival of nature. Chahrshanbeh Soori, is celebrated the last Tuesday night of the year.
Parwanaya: Five days that Hayyi Rabbi created the angels and the universe. The 5 epagomenals (extra days) inserted at the end of every Šumbulta (the 8th month) constitute the Parwanaya intercalary feast.
Dehwa d-Šišlam Rabba (Classical Mandaic: ࡃࡉࡄࡁࡀ ࡖࡔࡉࡔࡋࡀࡌ ࡓࡁࡀ) or Nauruz Zūṭa (Classical Mandaic: ࡍࡀࡅࡓࡅࡆ ࡆࡅࡈࡀ): Little New Year, on the 6th-7th days of Daula, corresponding to Epiphany in Christianity. The Night of Power takes place on the night of the 6th day (similar to Qadr Night), during which the heavenly gates of Abatur are open to the faithful. Priests visit Mandaean households and give them myrtle wreaths to hang on their houses for the rest of the year to protect against evil. The households also donate alms to the priests.
Dehwa Hanina (Classical Mandaic: ࡃࡉࡄࡁࡀ ࡄࡍࡉࡍࡀ) or Dehwa Ṭurma: the Little Feast, begins on the 18th day of Taura. This holiday commemorates the ascension of Hibil Ziwa from the underworld to the Lightworld. The feast lasts for three days. On the first day, Mandaean families visit each other and have a special breakfast of rice, yogurt, and dates. Baptisms are performed, and the dead are commemorated with lofani (ritual meals).
Ead Fel: (Memorial Day) Crushed dates with roasted sesame seeds are eaten.
Ashoriya (Ashuriyah): Day of remembrance for the drowned people of Noah's flood. Grains and cereals are eaten. Mandaeans believe that on this day, Noah and his son Sam made the food of forgiveness of sins for the souls of those who died in the flood. The food of forgiveness consists of seven grains representing the seven days of the week, and from the grounding of these seven grains came the name Abu Al-Harees. (See Ashure or Noah's pudding)
Ramadan: During this holy time, the ninth month of the Islamic calendar year, Muslims do not eat, drink, or smoke from sunrise to sunset for an entire month. Instead, they spend their days in worship, praying in mosques. At the end of Ramadan, people celebrate with a festival known as Eid al-Fitr.
Eid al-Fitr is the earlier of the two official holidays celebrated within Islam (the other being Eid al-Adha). The religious holiday is celebrated by Muslims worldwide because it marks the end of the month-long dawn-to-sunset fasting of Ramadan. The day is also called Lesser Eid, or simply Eid
Eid al-Adha is the latter of the two official holidays celebrated within Islam (the other being Eid al-Fitr). The day is also sometimes called Big Eid or the Greater Eid.
Islamic New Year, also called the Hijri New Year or Arabic New Year, is the day that marks the beginning of a new lunar Hijri year, and is the day on which the year count is incremented.
Ashura is an Islamic holiday that occurs on the tenth day of Muharram, the first month in the Islamic lunar calendar.
Mawlid Mawlid an-Nabi ash-Sharif or Eid Milad un Nabi is the observance of the birthday of the Islamic prophet Muhammad which is commemorated in Rabi' al-awwal, the third month in the Islamic calendar.
Isra and Mi'raj are the two parts of a Night Journey that, according to Islam, the Islamic prophet Muhammad (570–632) took during a single night around the year 621. The journey and ascent are marked as one of the most celebrated dates in the Islamic calendar.
Mid-Sha'ban also Bara'at Night, is a Muslim holiday observed by Muslim communities on the night between 14 and 15 Sha'ban (the same night as Shab-e-barat)
Day of Arafah is an Islamic holiday that falls on the 9th day of Dhu al-Hijjah of the lunar Islamic Calendar. It is the holiest day in the Islamic calendar (the holiest night being The Night of Power), the second day of the Hajj pilgrimage, and the day after is the first day of the major Islamic holiday of Eid al-Adha.
Pesach: late March or in April Festival celebrating the Hebrews captivity in Egypt at the time when God commanded Moses to ask for the Hebrew people to be released. As a result of being denied, 10 plagues came upon Egypt. One being the Angel of death coming and the first born son of each home dying. But God commanded the Hebrews to apply lambs blood to the door posts as a sign for the Angel to pass that house.
Hanukkah – Ḥănukkāh, usually spelled חנוכה, pronounced [χanuˈka] in Modern Hebrew; a transliteration also romanized as Chanukah), also known as the Festival of Lights or the Feast of Dedication, is an eight-day Jewish holiday commemorating the re-dedication of the Holy Temple (the Second Temple) in Jerusalem at the time of the Maccabean Revolt against the Seleucid Empire of the 2nd century BC. Hanukkah is observed for eight nights and days, starting on the 25th day of Kislev according to the Hebrew calendar, which may occur at any time from late November to late December in the Gregorian calendar.
Diwali: mid-October–mid-November – known as the Festival of Lights, this Hindu holiday celebrates the victory of good over evil. The five-day festival is marked by ceremonies, fireworks and sweets.
Navratri: The great nine nights of the Goddess Durga, commemorating Her victory against the demon Mahish Navratri: The great nine nights of the Goddess Durga, commemorating Her victory against the demon Mahishasura.
Easter: the first Sunday after the Paschal full moon/the first full moon after the vernal equinox—shortly after Passover; typically in April, but sometimes in March or May
Good Friday: Good Friday is a Christian religious holiday commemorating the crucifixion of Jesus Christ and his death at Calvary. The holiday is observed during Holy Week as part of the Paschal Triduum on the Friday preceding Easter Sunday, and may coincide with the Jewish observance of Passover. It is also known as Holy Friday, Great Friday, Black Friday, or Easter Friday, though the last term properly refers to the Friday in Easter week.
Advent: Advent is the preparation season for Christmas, when the first candle is lit on the Advent wreath and decorations go up. It starts on the first of four Sundays that precede Christmas. It can be as early as 27 November or as late as 3 December, depending on which day of the week Christmas falls. It will start on 1 December if Christmas is on a Wednesday.
Holiday: Around the time of Christmas, Hanukkah and Kwanzaa (generally known as the Christmas and holiday season), Pastafarians celebrate a vaguely defined holiday named "Holiday". Holiday does not take place on a specific date so much as it is the Holiday season itself. There are no specific requirements for Holiday, and Pastafarians celebrate Holiday however they please. They also celebrate Pastover and Ramendan.
Many religions whose holidays were formulated before the worldwide spread of the Gregorian calendar have been assigned to dates either according to their own internal religious calendar, or moon cycles, or otherwise. Even within Christianity, Easter is a movable feast and Christmas is celebrated according to the older Julian calendar instead of the Gregorian by some sects of the religion.