Alexanderson Day in Sweden
Alexanderson Day in Sweden is held on June 30. Celebrated on the Sunday closest to July 2. This event in the third decade of the month June is annual. 
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The Alexanderson day is named after the engineer and inventor Ernst Alexanderson which except for the transmitter system, only to be seen in Grimeton today, contributed to another 343 meaningful inventions that we humans benefit greatly from today. Alexanderson day falls annually on the Sunday closest to July 2, an important date for the station in several ways. July 2 1925 the station was inaugurated by the Swedish king Gustav V and on July 2 2004 the site was inscribed on UNESCO´s World Heritage List.
Alexanderson Day held either on the last Sunday in June, or on the first Sunday in July, whichever comes closer to 2 July, is the day of the open house at the Swedish government VLF transmitter Grimeton, call sign SAQ, located near Varberg.
Similar holidays and events, festivals and interesting facts
International Day of Women in Diplomacy on June 24
Birthday of Victoria, Crown Princess of Sweden, an official flag day on July 14
Fallens Dagar or The Waterfall Days in Trollhättan, Sweden on July 19 (Held on the third Friday every year since 1959, the festival is famous for its great music, fun activities, entertaining performances and exciting competitions.);
Olsok or St. Olaf's Day on July 29 (King Olaf II Haraldsson of Norway is remembered as Rex perpetuus Norvegiae, the Eternal King of Norway. Olsok is a national day of celebration in the Nordic countries of Norway and the Faroe Islands, and also in the provinces of Härjedalen in Sweden and Savonlinna in Finland);
International Embroidery Day or World Embroidery Day on July 30 (founded by the Swedish 'Broderiakademin, BRAK' in 2011);
Namesday of the Queen in Sweden on August 8 (On this day in 1901, the Swedish naming calendar, established by the Swedish Academy, was published. Namesday of the Queen, dedicated to this event, gained official status by 1972);
National Coffee Day on September 29
Archangels Michael, Gabriel and Raphael's Day on September 29
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