Seven Sleepers' Day or Siebenschläfertag
Seven Sleepers' Day or Siebenschläfertag is held on June 27. Germany. This event in the third decade of the month June is annual. 
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Dormouse has always had a fixed date, June 27th. Until the 16th century, however, the day of the dormouse referred to the weather conditions at the end of the first week of July. The reason for this is the introduction of the Gregorian calendar in 1582. It corrected an inaccuracy in the previously valid Julian calendar and resulted in a shift of around 11 days. The original dormouse day is therefore July 7th or 8th.
Similar holidays and events, festivals and interesting facts
Ratcatcher's Day on June 26 (Hamelin, Germany);
Studi Festival Siegen on June 26
Filmnächte am Elbufer in Dresden on June 26
Wimpfen Valley Market on June 26
Ratha Yatra on June 27 (Held on the second day of Shukla Pakshi of the Hindu lunar month of Ashadha);
Hanover Shooting Festival on June 27 (The ten-day event begins on the last Friday in June);
Strawberry Festival in Mainz-Gonsenheim on June 27
Regensburg Citizens' Festival on June 27
St. Wendel Town Festival on June 27
Theelfest in Lebach on June 27
Elbhangfest on June 27 (Pillnitzer Landstraße, Loschwitz, Wachwitz, Pillnitz);
Karlsfeld Settlers' Festival on June 27
Daimler Day on June 28
Architecture and Engineering Day in Hamburg on June 28
Night of the Museums in Hanover on June 28
Summer Festival «Summer in the City» on June 28 (Bergheim);
Neunkirchen Town Festival on June 28
Telemann Summer Festival on June 28
Festival in the Vogelviertel on June 28
Leonberg Summer Show on June 28
Forest Festival in Höfingen on June 28