Midsommardagen in Sweden
Midsommardagen in Sweden is held on June 20. Celebrated on Friday, falling between June 20 and 26. This event in the second decade of the month June is annual. 
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Midsummer started as a way to welcome summer (and maybe fertility). According to Sweden's Nordic Museum, Midsummer celebrations originally developed from a Christian holiday for John the Baptist, which took place on 24 June. Rather than having Midsummer always fall on a different day of the week, it was decided in 1953 that it should always be on the Friday between 20 and 26 June.
Most Swedish cities have their own Midsummer event, and many are marked by dancing around a flower-covered maypole, which some have interpreted as a representation of fertility (however, others argue that no explicit connection has been found between the two).
Similar holidays and events, festivals and interesting facts
Whit Monday on June 9 (celebrated on the day after Pentecost);
St John's Eve and the first day of the Midsummer celebrations on June 23 (Roman Catholic Church, Europe: - Bonfires of Saint John in Spain; Festa del Poble in Andorra; First night of Festa de São João do Porto; First day of Golowan Festival in Cornwall; Jaaniõhtu in Estonia; Jāņi in Latvia; Kupala Night in Belarus, Lithuania, Poland, Russia, Ukraine; Last day of Drăgaica fair in Buzău, Romania);
International Day of Women in Diplomacy on June 24
Alexanderson Day in Sweden on June 29 (celebrated on the Sunday closest to July 2);
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 18 (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)