I would like to propose the following holidays to be included!
Main article: Bahá'í Holy Days
Naw Ruz (Bahá'í New Year)
1st Day of Ridván
9th Day of Ridvan
12th Day of Ridvan
Day of the Covenant
Declaration of the Báb
Ascension of Bahá'u'lláh
Martyrdom of the Báb
Birth of the Báb
Birth of Bahá'u'lláh
Ascension of `Abdu’l-Bahá'
Pchum Ben (Cambodian)
Bon Festival (Japanese festival)
Blessed Rainy Day (Bhutanese)
Celtic, Norse, and Neopagan holidays
In the order of the Wheel of the Year:
Samhain (Celtic): 31 October – 1 November, Celtic New Year, first day of winter
Winter Nights (Norse): 29 October – 2 November, Norse New Year
Yule (Norse): 21–22 December, winter solstice, Celtic mid-winter
Imbolc (Celtic): 1–2 February, Celtic first day of spring
Ostara/Easter (Norse): 21–22 March, vernal equinox, Celtic mid-spring
Beltane (Celtic): 30 April – 1 May, Celtic first day of summer
Litha (Norse): 21–22 June, summer solstice, Celtic mid-summer
Lughnasadh (Celtic): 1–2 August, Celtic first day of autumn
Mabon/Harvest End (Norse): 21–22 September, autumnal equinox, Celtic mid-fall
See also: Swedish festivities
Chinese Religion holidays
Chinese New Year
See also: liturgical year
All Saints' Day
All Souls' Day
Ascension Thursday (Ascension of Jesus into Heaven)
Ash Wednesday (beginning of Lent)
Assumption of Mary (Assumption of the Virgin Mary)
Christmas (Birth of Jesus)
Corpus Christi (Sacrifice of Jesus)
Divine Mercy Sunday
Easter (Resurrection of Jesus, end of Lent)
Holy Thursday (Celebration of The Last Supper)
Good Friday (Death of Jesus)
Easter Monday (Monday following Easter Sunday, not part of the Easter Triduum)
Feast of the Sacred Heart
Feast of the Immaculate Conception
Saint Valentine's Day
Lent (40 days of penance before Easter)
Pentecost or Whitsun (Descent of the Holy Spirit upon the disciples of Jesus)
Shrove Tuesday or Mardi Gras (last day of Carnival, last day before Ash Wednesday)
The Catholic patronal feast day or 'name day' are celebrated in each place's patron saint's day, according to the Calendar of saints.
Diwali (Laxmi Puja)
Diwali (Govardhan Puja)
Main article: Jewish holiday
Hanukkah (also: Chanukah, the Festival of Lights)
Passover (Deliverance of Jews from slavery in Egypt)
Purim (Deliverance of Jews in Persia from Haman)
Rosh Hashanah (New Year)
Shavuot (Festival of Weeks; Harvest Festival)
Sukkot (The Feast of Tabernacles)
Tisha B'Av (Day commemorating the destruction of the First and Second Temples)
Tu Bishvat (New year of the trees)
Yom Kippur (Day of Atonement)
Simchat Torah (Completion of the Sefer Torah)
Shemini Atzeret (The beginning of the rainy season in Israel, sometimes confused as being the 8th day of Sukkot)
Shabbat (The day of rest, the seventh day of the week, and the holiest day of the week Saturday)
Lag B'Omer (A Jewish holiday celebrated on the 33rd day of the Counting of the Omer, which occurs on the 18th day of the Hebrew month of Iyar)
Islamic New Year – on first day of Muharram every year
Ashurah – tenth day of Muharram. Muharram is the first month of the lunar year.
Chaand Raat – Eve of Eid ul-Fitr
Eid (feast): date determined by the lunar calendar and observation of the moon:
Eid ul-Fitr – on the first day of Shawal. It marks the end of Ramadan, the fasting month. Part of honoring this occasion is "zakaat ul-fitr" (giving alms to the needy on the day of Eid ul-Fitr).
Eid ul-Adha – on the tenth day of Dhulhijjah, the twelfth and final month of the lunar year.
Eid ul-Milad an Nabi – Celebration of Prophet Muhammad's birth
Nuzul Al Qur'an – First revelation of Quran
Holy Month of Ramadan / Fasting – First day of Ramadan
Jumu'atul-Wida – on last Friday before celebration Eid ul-Fitr
Isra and Miraj – Prophet Muhammad's ascension to heaven.
Arafat – Eve of Eid ul-Adha
Western winter holidays in the Northern Hemisphere
Main article: Christmas and holiday season
See also: List of winter festivals and Chinese New Year
The following holidays are observed to some extent at the same time during the Southern hemisphere's summer, with the exception of Winter Solstice.
Thanksgiving – (fourth Thursday in November in United States) — Holiday generally observed as an expression of gratitude, traditionally to God, for the autumn harvest. It is traditionally celebrated with a meal shared among friends and family in which turkey is eaten. It is celebrated by many as a secular holiday, and in the USA marks the beginning of the "holiday season". In Canada, since the climate is colder, the harvest season begins (and ends) earlier and thus, Thanksgiving takes place on the second Monday in October.
Winter Solstice, Yule – (Winter solstice, around 21–22 December in the northern hemisphere and 21–22 June in the southern hemisphere) — The celebrations on the winter solstice, the longest night and shortest day of the year, are traditionally marked with anything that symbolizes or encourages life. Decorations of evergreens, bright objects and lights; singing songs, giving gifts, feasting and romantic events are often included. For Neopagans this is the celebration of the death and rebirth of the sun and is one of the eight sabbats on the wheel of the year.
Hanukkah – (26 Kislev – 2/3 Tevet – almost always in December) — Jewish holiday celebrating the defeat of Seleucid forces who had tried to prevent Israel from practicing Judaism, and also celebrating the miracle of the Menorah lights burning for eight days with only enough olive oil for one day.
Christmas Eve – (24 December) — Day before Christmas. Observances usually include big feasts at night to celebrate the day to come. It is the supposed night that Santa Claus delivers presents to all the good children of the world.
Christmas Day – (25 December) — Christian holiday commemorating the traditional birth-date of Jesus. Observances include gift-giving, the decoration of trees and houses, and Santa Claus folktales.
Kwanzaa (USA) – (26 December – 1 January) — A modern American invention held from 26 December to 1 January honoring African-American heritage, primarily in the United States. It was invented in 1966 by black activist and marxist Ron Karenga.
St Stephen's Day or Second Day of Christmas (26 December) — Holiday observed in many European countries.
Boxing Day (26 December or 27 December) — Holiday observed in many Commonwealth countries on the first non-Sunday after Christmas.
New Year's Eve – (31 December) — Night before New Year's Day. Usually observed with celebrations and festivities in anticipation of the new year.
New Year's Day – (1 January) — Holiday observing the first day of the year in the Gregorian calendar.
Incomplete list of National holidays by country
Korea national alphabet day 9 October
See also: International observance
Many other days are marked to celebrate events or people, around the world, but are not strictly holidays as time off work is rarely given.
Halloween (31 October, especially in the UK and former British colonies, including the US, Canada, and Australia). Formerly All Hallows' Eve, it is a highly secularized outgrowth of Christian All Saints Day and pagan Celtic Samhain (both on 1 November).
International Women's Day (8 March, particularly in former Soviet bloc countries and mainland China)
International Men's Day (19 November in Canada, Australia, India, Jamaica, Trinidad and Tobago, United Kingdom, Singapore, South Africa and Malta)
Labour Day, Worker's Day or May Day (1 May in most countries. The United States and Canada both celebrate on the first Monday in September)
Mother's Day (date varies widely, e.g. second Sunday in May in parts of North America, 10 May in Mexico; in the UK it is on the fourth Sunday in Lent and has an Anglican origin)
International Day of Peace (21 September, decided by the fifty-fifth session of the General Assembly of the United Nations)
Other secular holidays not observed internationally:
Lee-Jackson-King Day (20 January) Combined holiday celebrated in the Commonwealth of Virginia from 1984 to 2000
Martin Luther King, Jr. Day (third Monday in January in the United States)
Groundhog Day (2 February in United States and Canada)
Darwin Day (12 February). Commemorates the anniversary of the birth of Charles Darwin to highlight Darwin's contribution to science and to promote science in general.
Presidents Day (Third Monday in February in United States; US federal holiday). Honors the birthdays of George Washington and Abraham Lincoln
Confederate Memorial Day Celebrated by the original Confederate States at various times during the year; still celebrated on the fourth Monday in April in Alabama
Longtail Day (Final Thursday before a Leap Day; Isle of Man) A day of bad luck
Patriot's Day (Third Monday in April in Massachusetts and Maine, United States)
Earth Day (22 April) Celebrated in many countries as a day to cherish nature.
Queen's Day (30 April in the Netherlands)
Labour Day (Many European and South American countries celebrate Labour Day on 1 May)
Constitution Day (3 May) is one of the two most important national holidays in Poland (other being National Independence Day on 11 November). It commemorates proclamation of Constitution of 3 May (the first modern constitution in Europe) by the Sejm of Polish–Lithuanian Commonwealth in 1791.
Youth Day (4 May in the People's Republic of China, in commemoration Beijing students who protested against Western imperialism on this day)
Victoria Day (Monday on or before 24 May in Canada, also in some parts of Scotland)
Flag Day (14 June in the United States, 2 May in Poland)
Juneteenth (19 June) Official holiday in 14 states that commemorates the abolition of slavery in Texas (unofficial in 5 other US states)
Canada Day (1 July) in Canada, celebration of the date of the Confederation of Canada. Formerly known as Dominion Day, as this was the day on which Canada became a self-governing Dominion within the British Empire.
Independence day or National day (4 July in the United States and other dates in many nations; it is the most important holiday in various countries around the globe.)
Pioneer Day (24 July in Utah, United States)
Army Day (1 August in the mainland territory of the People's Republic of China)
Labor Day (first Monday in September in the United States (federal holiday), and Canada, where it is known as Labour Day)
Grandparents Day (Sunday after September Labor Day – proclaimed in the United States by Jimmy Carter in 1978)
Columbus Day (Celebrated by the U.S. on the second Monday in October.)
Nanomonestotse (Starts the third Monday in October) Celebration of peace, observed within some Native American families.
Guy Fawkes Night Day (5 November) In memory of the failed Gunpowder Plot by Guy Fawkes Celebrated in Great Britain and other countries of the commonwealth
Melbourne Cup Day (held on the first Tuesday of November – the day of the Melbourne Cup in the Melbourne metropolitan area)
Saint Nicholas Day (5 December in the Netherlands, 6 December in Belgium)
Boxing Day (26 December in the Commonwealth of Nations)
See also: Category:Unofficial observances
These are holidays that are not traditionally marked on calendars. These holidays are celebrated by various groups and individuals. Some are designed to promote a cause, others recognize historical events not recognized officially, and others are "funny" holidays, generally intended as humorous distractions and excuses to share laughs among friends.
Beluga Whale Day (2 February)
Friday the 13th
April Fools' Day (1 April)
Bloomsday (16 June based on James Joyce's novel Ulysses)
Black Friday (The day after Thanksgiving in the United States.)
Brookemas (7 July) (The worldwide celebration of the birth of Allyson Brooke Hernandez)
Buy Nothing Day (The day after Thanksgiving in the United States)
Christmas Eve (24 December)
Festivus (23 December)
First Contact Day (5 April) (The day Vulcans establish first contact with humanity)
Friendship Day (first Sunday in August)
GIS Day (The Wednesday during Geography Awareness Week in November)
Giving Tuesday (The Tuesday following Thanksgiving Day, Black Friday and Cyber Monday in the United States)
Galactic Tick Day (every 633.7 days, starting October 2, 1608)
International Cannabis Day/Four Twenty (20 April) (counterculture holiday for promotion of marijuana)
International Talk Like a Pirate Day (19 September)
Ninja day (5 December)
Marathon Monday (local name in Boston for Patriot's Day)
Mischief Night (30 October)
Mole Day (23 October)
Monkey Day (14 December)
National Cancer Survivors Day (first Sunday in June)
National Gorilla Suit Day (31 January)
National Hug Day (21 January)
No Pants Day (first Friday of May)
Pi Day (14 March) or Pi Approximation Day (22 July)
Record Store Day (third Saturday of April)
Robert Burns Day/Burns Night (25 January)
Super Bowl Sunday (Day of the National Football League championship)
S.A.D. – (Singles Awareness Day) (14 February)
Star Wars Day (4 May) "May the Fourth be with you"
Sweetest Day (3rd Saturday in October)
Tax Freedom Day
Towel Day (25 May) (a tribute to the late Douglas Adams)
Women Gamers Day (18 June) (A day for girls who enjoy video games)
Opposite Day (25 January) (day where you do everything opposite)
Put A Pillow On Your Fridge Day (29 May)
Lost Penny Day(9 May)
Take Your Houseplant For A Walk Day (27 July)