Birthday of Queen Margrethe II of Denmark is celebrated on April 16. It is not a public holiday in Denmark, but the Queen typically makes an appearance, and some events are held.

Birthday of H.M. Queen Margrethe II - Denmark

Passover or Pesach is a major Jewish holiday and one of the most widely celebrated Jewish holidays. Together with Shavuot and Sukkot, Passover was one of the Three Pilgrimage Festivals during which the entire population of the kingdom of Judah made a pilgrimage to the Temple in Jerusalem.

Passover - First Day - Jewish

Passover starts on the 15th day of Nisan in the Hebrew calendar and lasts for 7 or 8 days, usually in April. It celebrates the liberation of the Israelites from slavery on Egypt.

Passover begin at sundown

April Fool’s Day is celebrated as a day of jokes and trickery on April 1. Other names include April Noddy Day, Gowkie Day, Huntigowk Day and St All-Fool’s Morn. #aprilfoolsday

April Fool's Day

International Children's Day is a day recognized to celebrate children. The day is celebrated on various dates in different countries.

International Children's Day

The Passover Seder is a Jewish ritual feast that marks the beginning of the Jewish holiday of Passover. It is conducted throughout the world on the evening of the 14th day of Nisan in the Hebrew calendar.

Passover - Second Day - Jewish

Maundy Thursday is the Christian holy day falling on the Thursday before Easter. It commemorates the Washing of the Feet and Last Supper of Jesus Christ with the Apostles, as described in the canonical gospels.

Maundy Thursday

Good Friday is a Christian holiday commemorating the crucifixion of Jesus and his death at Calvary. It 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.

Good Friday

Holy Saturday, the Saturday of Holy Week, also known as Holy and Great Saturday, the Great Sabbath, Black Saturday, Joyous Saturday, Hallelujah Saturday or Easter Eve, and called "Joyous Saturday" or "the Saturday of Light" among Coptic Christians, is the day after Good Friday.

Holy Saturday

Easter Sunday, also called Pascha or Resurrection Sunday, is a festival and holiday commemorating the resurrection of Jesus from the dead, described in the New Testament as having occurred on the third day after his burial following his crucifixion by the Romans at Calvary c. 30 AD.

Easter Sunday - International

The Qingming or Ching Ming festival, also known as Tomb-Sweeping Day in English, is a traditional Chinese festival observed by the Han Chinese of China, Taiwan, Hong Kong, Macau, Malaysia, Singapore, Indonesia, Thailand.

Qing Ming Festival - China

April 5, marks National Go for Broke Day, a commemoration of the spirit of the brave Nisei veterans who gave their all for their country and the dignity of their families.

Go For Broke Day

Arbor Day

Officially known as 'King Buddha Yodfa Chulaloke the Great Day and Chakri Dynasty Memorial Day', Chakri Day commemorates the establishment of the Chakri Dynasty by Phra Buddha Yodfa Chulalok

Chakri Day - Thailand

The World Health Day is a global health awareness day celebrated every year on 7 April, under the sponsorship of the World Health Organization (WHO), as well as other related organizations.

World Health Day

In Southland Region, the most southerly of all New Zealand’s regions, Southland Anniversary Day is a public holiday and off-work day that comes on the Tuesday after Easter.

Southland Anniversary Day - New Zealand

Araw ng Kagitingan is a non-working holiday that is part of a long weekend in the Philippines. World War II veterans parade in different cities in the Philippines on this day. The Araw ng Kagitingan’s main highlight occurs when the president gives a speech to commemorate the heroism of the Filipinos

The Day of Valor

Siblings Day is a holiday recognized annually in some parts of the United States on April 10, and as Brothers and Sisters Day on May 31st in Europe, honoring the relationships of siblings.

National Siblings Day

National Pet Day encourages us to pay special attention to pets who may not get that extra attention. Helping out orphaned pet companions will improve their health and enhance their opportunities for adoption.

National Pet Day

The International Day of Human Space Flight is the annual celebration, held on April 12, of the anniversary of the first human space flight by Yuri Gagarin. It was proclaimed at the 65th session of the United Nations General Assembly on April 7, 2011.

International Day of Human Spaceflight

Sham Ennessim is an Egyptian national holiday marking the beginning of spring. It always falls on the day after the Eastern Christian Easter.

Sham Ennessim - Egypt

Yom Hazikaron laShoah ve-laG'vurah, known colloquially in Israel and abroad as Yom HaShoah and in English as Holocaust Remembrance Day, or Holocaust Day, is observed as Israel's day of commemoration for the approximately six million Jews who perished in the Holocaust.

Yom Hashoah - Jewish

Thingyan is the Burmese New Year Festival that usually occurs in middle of April. It is a Buddhist festival celebrated over a period of four to five days, culminating in the New Year. The dates of the Thingyan Festival are calculated according to the Burmese calendar.

Thingyan Water Festival - Myanmar

Songkran is the Thai New Year's national holiday. Songkran is 13 April every year, but the holiday period extends from 14 to 15 April. In 2018 the Thai cabinet extended the festival nationwide to five days, 12–16 April, to enable citizens to travel home for the holiday.

Songkran Festival - Thailand

Equal Pay Day is the symbolic day dedicated to raising awareness of the gender pay gap. In the United States, this date symbolizes how far into the year women must work in order to earn what men earned in the previous year.

National Equal Pay Day

Sermon of the Tortillas (Teruel)

Declaration of Malacca as Historical City (Malacca)

World Art Day (Rittik Day) is an international celebration of the fine arts which was declared by the International Association of Art (IAA) in order to promote awareness of creative activity worldwide.

World Art Day

Tax Day is the deadline for United States residents to file details of their income to the Internal Revenue Service (IRS) so that their liability for income tax can be assessed.

Tax Day

National High Five Day takes place on the third Thursday of each April and is as simple as it sounds - a holiday about giving high fives and spreading good vibes.

National High-Five Day

Evacuation Day, is Syria's national day commemorating the evacuation of the last French soldier and Syria's proclamation of full independence and the end of the French mandate of Syria on 17 April 1946.

Independence Day - Syria

Yom HaZikaron, is Israel's official remembrance day, enacted into law in 1963. While Yom HaZikaron has been traditionally dedicated to fallen soldiers, commemoration has also been extended to civilian victims of terrorism.

Yom HaZikaron - Jewish

UN Chinese Language Day is observed annually on April 20. The event was established by the UNESCO in 2010, seeking "to celebrate multilingualism and cultural diversity as well as to promote equal use of all six of its official working languages throughout the organization".

Chinese Language Day

Independence Day is the national day of Israel, commemorating the Israeli Declaration of Independence in 1948. The day is marked by official and unofficial ceremonies and observances.

Yom Ha'atzmaut - Jewish

International Mother Earth Day was established in 2009. The Resolution was introduced by The Plurinational State of Bolivia and endorsed by over 50 member states. It recognizes that "the Earth and its ecosystems are our home" and that "it is necessary to promote harmony with nature and the Earth."

International Mother Earth Day

Many fans and enthusiasts of William Shakespeare, who was one of England’s greatest poets and dramatists, celebrate National Shakespeare Day, also known as Shakespeare Day, on April 23.

National Shakespeare Day

St George's Day in England is a celebration of Saint George, a Christian martyr and soldier in the Roman army.

St. George's Day

National Sovereignty and Children’s Day in Turkey, observed every April 23, commemorates the Turkish Parliament’s creation and celebrates children’s role in the country’s development.

National Sovereignty and Children's Day

Celebrated on April 23rd annually, English Language Day is celebrated because it is thought to be Shakespeare's birthday, and the anniversary of his death. As well as being the English language's most famous playwright, Shakespeare also had a huge impact on modern-day English.

English Language Day

World Book Day, also known as World Book and Copyright Day, or International Day of the Book, is an annual event organized by the United Nations Educational, Scientific and Cultural Organization (UNESCO) to promote reading, publishing, and copyright.

World Book and Copyright Day

The day is meant to celebrate the invention of the telephone, on the date when Alexander Graham Bell had a patent filed a patent for what would be his telephone.

National Telephone Day

Sinai Liberation day is a public holiday in Egypt which celebrates the liberation of the land of Sinai from occupation back to Egyptian sovereignty. It is the anniversary of the liberation of the peninsula of Sinai corresponding to April 25 of each year.

Sinai Liberation Day - Egypt

Anzac Day is a national day of remembrance in Australia and New Zealand that broadly commemorates all Australians and New Zealanders "who served and died in all wars, conflicts, and peacekeeping operations" and "the contribution and suffering of all those who have served".

ANZAC Day

Birthday of the Sultan of Terengganu (Terengganu)

Koningsdag, the date marks the birth of King Willem-Alexander. Until the abdication of Queen Beatrix in 2013, the holiday was known as Koninginnedag or Queen's Day and was celebrated on 30 April.

King's Day

Freedom Day is a public holiday in South Africa celebrated on 27 April. It celebrates freedom and commemorates the first post-apartheid elections held on that day in 1994.

Freedom Day - South Africa

Shōwa Day is a Japanese annual holiday held on April 29. It honors the birthday of Emperor Shōwa (Hirohito), the reigning emperor from 1926 to 1989. Shō means “shining” or “bright”, and wa means “peace”, signifying the "enlightened peace" that citizens receive.

Showa Day - Japan

International Dance Day is a global celebration of dance. The event takes place every year on 29 April, which is the anniversary of the birth of Jean-Georges Noverre, the creator of modern ballet. The day strives to encourage participation and education in dance through events and festivals.

International Dance Day

National Adopt a Shelter Pet Day is observed each year on April 30.  This day was created as a way to raise awareness for thousands of pets that are waiting for (and needing) adoption.