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According to theory, the celebration goes back to the Iron Age when both Bohemia and Moravia were occupied by Celts. A similar traditional holiday is still celebrated in Ireland, Scotland and the Isle of Man.
Some people also call this Walpurgis Night, named after Saint Walpurga. Walpurgis Night is a traditional German and Scandinavian celebration that dates back to the Vikings.
Basically, this is just an excuse for a party. Tonight I'm taking my first trip to Hungary so maybe I'll get the chance to see a bonfire next year.