In Sweden there is an old saying that in the night between wednesday and thursday in the week of Easter, Witches fly on a broom to a place called "Blåkulla" to attend a wild party with the Devil the whole weekend.

I think I spotted one of those Witches today ;-)

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@ambivalena We have something similar here in northern Germany: Walpurgis Night. It is celebrated on the night of 30 April to 1 May, the night when witches held a great festival, particularly on the Blocksberg (actually ‘Brocken’), but also at other high points.
@Moorknipser We celebrate that too, "Valborsmässoafton" and it has the same origin that you have, but today we celebrate it for the arrival of spring.
@ambivalena Oh, I see! Learnt something new again.