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
Anniversary of the liberation from National Socialism on May 8
Arolsen Baroque Festival on May 8
Traunstein Spring Festival on May 8 (starts on Father's Day evening);
Schmelzer Schmackes on May 8
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);
Father's Day in Germany on May 9 (Vatertag is always celebrated on Ascension Day);
Christ's Ascension on May 9 (or Kristi Himmelfartsdag in Norway);
Freienfels Knights' Games on May 9 (Taking place on Ascension Day weekend);
Putbus Festival on May 9
Müritz Sail on May 9
Day of the Fire Department in Mainz-Drais on May 9
Book Day in Germany on May 10
Blood ride in Weingarten on May 10 (A mystical horse procession);
Brothers Grimm Festival in Hanau on May 10
Constance Campus Festival on May 10
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)