Catholic or protestant : In the year 325, the Council of Nicée determined a date fo Easter. Full Moon would fall the 14th day of a moon month (1). Easter would be marked by the dominical letter(2)and the epactus(3). With the establishment of the equinox ne variatur on March 21, algorithms where elaborated to attribuate a date for Easter whatever the year.
Time between two consecutive new moons: 20 days 12 hours 44 minutes 2.8 - Gives a letter code for the year's calendar Age of the moon on January 1st, minus one unity, 0 being the new moon's age.

School holidays :

Catholic or protestant : Easter Monday

Banks only :

Catholic or protestant : Easter Monday In Edinburg only

Sports events : Www.itzulia.net Cycling race - lasts 5 days - 2024 edition confirmed

School holidays :

Sports events : Www.atptennis.com 2024 edition confirmed

Catholic : Easter Monday only observed by the Catholic community

Tradeshows : Http://www.mosbuild.com lasts 4 days - in Moscow 2024 edition confirmed

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Special Events : In tribute to the victims of a school shooting

Secular holiday : Commemoration of a battle that opposed the people of Glarus and some Swiss Confederates to the Duke of Austria in 1388

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Sports events : Www.runczech.com 2024 edition confirmed

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Tradeshows : Www.croatiaboatshow.com lasts 5 days - in Split - 2024 edition NOT YET confirmed

Special Events :

Special Events :

Sports events : Http://montecarlotennismasters.com/ 2024 edition confirmed

Sports events : Https://www.mein-freiburgmarathon.de/ 2024 edition confirmed

Sports events : Www.schneiderelectricparismarathon.com 2024 edition confirmed

Sports events : Http://linz-marathon.at/ 2024 edition confirmed

Secular holiday : Second Monday after Easter Barcelona only

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Tradeshows : Https://portal.etoa.org lasts 2 days -- in London 2024 edition confirmed

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Secular holiday : In London area

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Muslim, Sufi : Adyghaya, Bashkortostan, Chechnya, Daghestan, Federal District of the North Caucasus, Ingushia, Kabardino-Balkaria, Karachaevo-Cherkessia, Tatarstan, Crimea

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Muslim, Sufi : Ends the ninth month in the Islamic calendar. There were 30 days of strict fasting from sunup to sundown in honor of the first revelation to the Prophet Mohammed.

Muslim, Sufi : This day is an important religious holiday celebrated by Muslims worldwide that marks the end of Ramadan, the Islamic holy month of fasting (sawm).

Muslim, Sufi : End of Ramadan from 2021

Muslim, Sufi : Ends the ninth month in the Islamic calendar. There were 30 days of strict fasting from sunup to sundown in honor of the first revelation to the Prophet Mohammed.

Muslim, Sufi : Eid al-Adha Republic of Bashkortostan

Catholic : 300,000 people take part in this pilgrimage which dates back to 1489, when a pilgrimage was organized to pray for rain. 2024 edition confirmed

School holidays : one or two weeks later in Oberwallis (Haut-Valais)

Muslim, Sufi : This day is an important religious holiday celebrated by Muslims worldwide that marks the end of Ramadan, the Islamic holy month of fasting (sawm). Paid holiday when falling on Saturday or Sunday

Tradeshows : Www.internationalproperty.ru/ lasts 2 days - 2024 edition confirmed

Tradeshows : Www.miart.it lasts 4 days - 2024 edition confirmed

Tradeshows : Https://www.festivaldulivredeparis.fr/ lasts 4 days - in Paris 2024 edition confirmed

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Muslim, Sufi : This day is an important religious holiday celebrated by Muslims worldwide that marks the end of Ramadan, the Islamic holy month of fasting (sawm).

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Sports events : Www.marathon-hannover.de/ 2024 edition confirmed

Tradeshows : Www.feriadesevilla.andalunet.com lasts 6 days 2024 edition confirmed

Tradeshows : Lasts 5 days - www.vinitaly.com in Verona 2024 edition confirmed

Sports events : Https://www.deutschepostmarathonbonn.de/ 2024 edition confirmed

Sports events : Https://guernsey-marathon.com/ 2024 edition confirmed

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Sports events : Http://fr.marathonrotterdam.org/ 2024 edition confirmed

Sports events : Www.atptennis.com/ 2024 edition confirmed

School holidays :

Sports events : Www.atptennis.com/ 2024 edition confirmed

School holidays : lrschool.co.uk

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Tradeshows : Lasts 4 days - www.inventions-geneva.ch/ 2024 edition confirmed

Secular holiday : Following the catastrophic train accident in central Greece

Secular holiday : Mesón de las Tortillas Teruel only

Secular holiday :

Special Events :

Sports events : Https://www.wrc.com/ Junior WRC 2024 edition confirmed

Tradeshows : Www.aero-friedrichshafen.com lasts 4 days - in Friedrichshafen 2024 edition confirmed

Sports events : In Le Castellet, Southern France 2024 edition confirmed

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Secular holiday :

School holidays :

Sports events : Www.zurichmarathon.ch 2024 edition confirmed

Sports events : Www.connemarathon.com/ 2024 edition confirmed

Sports events : Https://www.virginmoneylondonmarathon.com 2024 edition confirmed

Sports events : Https://runinbudapest.com 2024 edition confirmed

Sports events : Www.enschedemarathon.nl 2024 edition confirmed

Sports events : Https://www.metro-marathon.de/ 2024 edition confirmed

Sports events : Www.leipzigmarathon.de/ 2024 edition confirmed

Sports events : Www.vienna-marathon.com/ 2024 edition confirmed

Sports events : Www.cracoviamaraton.pl/ 2024 edition confirmed

Sports events : Http://maratonasantantonio.it/ 2024 edition confirmed

Tradeshows : Www.hannovermesse.de lasts 5 days - 2024 edition confirmed

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Secular holiday :

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Sports events : Https://www.tourderomandie.ch/
Cycling race -- lasts 5 days in the Vaud, Fribourg and Neuchatel cantons 2024 edition confirmed

Sports events : Www.atptennis.com/ 2024 edition confirmed

Secular holiday :

Secular holiday : Seville Festival in Seville only

Special Events :

Secular holiday : Sumardagurinn fyrsti

Tradeshows : Www.boatshowpalma.com/en/ Palma de Mallorca International Boat Show lasts 3 days 2024 edition confirmed

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School holidays :

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Special Events :

School holidays : www.lfh.gr

Secular holiday : Koningsdag

Secular holiday :

School holidays :

Sports events : Www.esmadrid.com/ 2024 edition confirmed

Sports events : Www.motogp.com/ 2024 edition confirmed

Sports events : Www.haspa-marathon-hamburg.de 2024 edition confirmed

School holidays :

Sports events : Www.oberelbe-marathon.de/ 2024 edition confirmed

Sports events : Https://bgdmarathon.org 2024 edition confirmed

cards/flowers : In the early 1950s, former deportees or their families wanted a national celebration for preserving the memory of the deportation. The law of 14 April 1954, unanimously passed by the French Parliament has responded to the need to preserve the memory of the deportation by creating the National Day of Remembrance of the victims and heroes of the deportation .

cards/flowers : Deliverance of the Jewish people from Egypt. The Seder service on the first two evenings recounts the story of the Exodus

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Secular holiday :

School holidays : Commemorates the start of a revolt which culminated on 28 April 1794 (commemorated today as sa die de sa Sardigna) with the expulsion or even execution of the Piedmontese officers for a few days from the Capital Cagliari. [Wikipedia]

Secular holiday : Dedicated to those who have died in industrial accidents at work.

Secular holiday :

Banks only : Both a Christian and pagan holiday. The day of the witches announces the arrival of spring.

cards/flowers : As the story goes, in 1564, France was one of the first nations to make January 1 officially New Year's Day, instead of the last week of March which was previously observed. In 1582, the Pope followed suit. Those who went on celebrating April 1st were mocked. As the zodiacal sign was the fish, The French placed dead fish on the backs of one another. Traditions vary from country to country.

Secular holiday : Designation of the heads of local families who will govern for one year.

Secular holiday : In the 1950's, Greek Cypriots, under the leadership of Archbishop Makarios, started a campaign for enosis (union with Greece). A Greek Cypriot secret organization called EOKA started guerrilla attacks on the British Paid holiday when falling on Saturday or Sunday

Secular holiday : Commemorates the First Rom World Congress in London in 1971. Marks the beginning of the first International Roma organization and the introduction of the name Rom (instead of Gypsy), and of the Romani anthem and flag, observed by the Roma community only

Secular holiday : Commemorates the First Rom World Congress in London in 1971. Marks the beginning of the first International Roma organization and the introduction of the name Rom (instead of Gypsy), and of the Romani anthem and flag,

Secular holiday : In accordance with the terms of entry into Russia, Crimea has received the status of the Republic. On April 11, 2014 the State Council of the Republic of Crimea adopted the Constitution, and the next day the text of the document was published. The adoption of this document has completed the process of joining the Crimea to Russia at the legislative level.

Secular holiday : To mark the 1783 annexation of Crimea after Catherine the Great defeated the Ottomans.

Secular holiday :

Secular holiday : St George Cáceres only

Secular holiday : In tribute to the current Pope's Christian name

Secular holiday : Merkið in Faroese - commemorates British recognition of the Faroese flag during World War 2 may be observed in the afternoon only

Secular holiday : Commemmorates the end of World War I on 11th November 1918. The armistice was signed between the Allies and Germany at Compiègne, France, for the cessation of hostilities on the Western Front, which took effect at eleven o'clock in the morning - the eleventh hour of the eleventh day of the eleventh month.

Catholic :

Secular holiday : Formerly known as the Liberation Front Day, this celebration marks the establishment, in 1941, of the Slovenian Liberation Front which fought against the German, Italian and Hungarian occupation. Wikipedia

Catholic : St Prudence Vitoria only