Europe Day
Europe Day is held on May 9. It is the name of two annual observance days, 5 May by the Council of Europe and 9 May by the European Union, which recognize the peace and prosperity within Europe that both have achieved since their formation. This event in the first decade of the month May is annual. 
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The European Union is a confederation (or a group) of 28 member countries in Europe, started in 1957. It has created a common economic area with Europe-wide laws allowing people to move and trade in other EU countries almost the same as they do in their own. In practical terms, this means that I, a French citizen, can work and live in Germany without needing a visa or any kind of special paperwork. I can come and go as I please. I don’t even need to show my passport to go between the two countries.
Similar holidays and events, festivals and interesting facts
Victory Day in Poland and Czech on May 8 (Narodowy Dzień Zwycięstwa in Poland established in 2015; Liberation Day in Czech Republic);
Johannian Holidays in Orleans, France on May 8 (in honor of the liberation in 1429 of Joan of Arc and her army from the city besieged by the British);
The day of the abolition of slavery in France on May 10 (Abolition de l'esclavage mark according to the law of May 21, 2001);
Mamertus, the first of the Ice Saints on May 11
World Fair Trade Day on May 13 (celebrated on the second Saturday of May);
Mother’s Day on May 14 (Anguilla, Antigua and Barbuda, Aruba, Australia, Austria, Bahamas, Bangladesh, Barbados, Belgium, Belize, Bermuda, Bhutan, Bonaire, Botswana, Brazil, Brunei, Canada, Cambodia, Cayman Islands, Central African Republic, Chad, Chile, China, Colombia, Congo, Dem. Rep., Congo, Rep., Cote d'Ivoire, Croatia, Cuba, Curaçao, Cyprus, Czech Republic, Denmark, Dominica, Ecuador, Equatorial Guinea, Estonia, Ethiopia, Faroe Islands, Fiji, Finland, Germany, Gabon, Gambia, Greenland, Ghana, Greece, Grenada, Guyana, Honduras, Hong Kong, Iceland, India, Italy, Jamaica, Japan, Kenya, Latvia, Liberia, Liechtenstein, Macau, Malaysia, Malta, Myanmar, Namibia, Netherlands, New Zealand, Pakistan, Papua New Guinea, Peru, Philippines, Puerto Rico, Saint Kitts and Nevis, Saint Lucia, Saint Vincent and the Grenadines, Samoa, Singapore, Sint Maarten, Slovakia, South Africa, Sri Lanka, Suriname, Switzerland, Taiwan, Tanzania, Tonga, Trinidad and Tobago, Turkey, Uganda, Ukraine, United States, Uruguay, Vietnam, Venezuela, Zambia, Zimbabwe);
Polish Border Guard Day on May 16
Bread Festival in France on May 16