May Eve
May Eve is held 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. This event in the third decade of the month April is annual. 
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Historically, Germans also believed May Day to be a time to give thanks and to celebrate fertility. The night before – or May Eve as it was commonly known – young, unmarried men would cut down a fir tree and remove its branches before decorating it and erecting it in the village square. The tree had to remain under the watchful eye of a guard overnight, for fear of it being stolen by men from a nearby village. If the guard fell asleep and the tree was stolen, there would be a ransom to be paid – often a good meal and a barrel of beer.
Similar holidays and events, festivals and interesting facts
International Financial Independence Day on April 25
King Day in Sweden on April 30 (Birthday of the King Carl XVI Gustaf, one of the official flag days of Sweden);
Christ's Ascension on May 6 (or Kristi Himmelfartsdag in Norway);
No Pants Day on May 7 (It is held on the first Friday in May);
Whit Monday on May 17 (celebrated on the day after Pentecost);
European Natura 2000 Day on May 21
Mother's Day in France on May 30 (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)
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