King Day in Sweden
King Day in Sweden is held on April 30. Birthday of the King Carl XVI Gustaf, one of the official flag days of Sweden. This event in the third decade of the month April is annual. 
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Carl Gustaf was born on 30 April 1946 at the Haga Palace in Solna, Stockholm County, as the only son of Prince Gustaf Adolf and Princess Sibyalla of Saxe-Coburg and Gotha. He became king on 15 September 1973. He is married to Silvia Sommerlath who is half German, half Brazilian. The night before, both King Carl Gustaf and his future wife Silvia had been serenaded by ABBA at the Royal Variety Performance, where the supergroup performed Dancing Queen in honour of the wedding.
Just like Britain's Duchess of Cambridge, Carl Gustaf is a huge supporter of the Scouts and is the Honorary Chairman of the World Scout Foundation. The prince is a passionate collector of automobiles and owns several Porsche 911s, which is said to be the Swedish monarch's favourite. Like many royals, the Swedish King is very sportive and enjoys riding, water sports and sailing.
Similar holidays and events, festivals and interesting facts
Easter Monday on April 21 (Påskedag in Norway);
May Eve on April 30 (the eve of the first day of summer in the Northern hemisphere; Beltane begins at sunset in the Northern hemisphere, Samhain begins at sunset in the Southern hemisphere; Carodejnice in Czech Republic and Slovakia; Walpurgis Night - Central and Northern Europe);
No Pants Day on May 2 (It is held on the first Friday in May);
European Natura 2000 Day on May 21
Mother's Day in France on May 25 (also Algeria, Dominican Republic. First Sunday of June, if Pentecost occurs on this day, Haiti, Mauritius, Morocco, Sweden, Tunisia; celebrated on the last Sunday in May);
Christ's Ascension on May 29 (or Kristi Himmelfartsdag in Norway);
National Day in Sweden on June 6 (marks the end of the Danish-ruled Kalmar Union)