EU Accession Day in Poland
EU Accession Day in Poland is held on May 1. This event in the first decade of the month May is annual. 
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Polish Prime Minister Leszek Miller, Foreign Minister Włodzimierz Cimoszewicz and the Minister of European Affairs Danuta Hübner signed the historical Accession Treaty on behalf of Poland in Athens on April 16th, 2003. On 1 May 2004 Poland became a full member of the European Union, along with 9 other European countries. Poland joined the EU on the same day as Cyprus, the Czech Republic, Estonia, Hungary, Latvia, Lithuania, Malta, Slovakia and Slovenia, in the biggest EU enlargement in history.
Similar holidays and events, festivals and interesting facts
International Sculpture Day on April 26 (Held on the last Saturday of April);
Majówka on May 1 (is a spring festival celebrated throughout Europe);
May Crownings or the Virgin Mary Month on May 1 (Catholic Church tradition);
Flag Day in Poland on May 2 (Rzeczypospolitej Polskiej);
Constitution Day in Poland on May 3
Steelworker's Day or Metallurgist's Day in Poland on May 4 (Metal and Mining Workers' Day);
Victory Day in Poland and Czech on May 8 (Narodowy Dzień Zwycięstwa in Poland established in 2015; Liberation Day in Czech Republic)