Norwegian Constitution Day
Norwegian Constitution Day is held on May 17. Grunnlovsdag. This event in the second decade of the month May is annual. 
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Among Norwegians, the day is referred to as syttende mai ("Seventeenth of May"), Nasjonaldagen ("National Day"), or Grunnlovsdagen ("Constitution Day"), although the latter is less frequent. The Constitution of Norway was signed at Eidsvoll on 17 May 1814. The constitution declared Norway to be an independent kingdom in an attempt to avoid being ceded to Sweden after Denmark–Norway's devastating defeat in the Napoleonic Wars.
Similar holidays and events, festivals and interesting facts
Constitution Day in Laos on May 11
Children's Day in Norway on May 17
Nauru Constitution Day on May 17
Constitution Day and Flag Day of Turkmenistan on May 18 (celebration of rebirth, unity and poetry of Magtymula Piragia);
Constitution Day in Germany on May 23
Constitution Day on the Faroe Island on June 5
Constitution Day in Denmark on June 5