Analysis of information sources in references of the Wikipedia article "ليلة فالبورجيس" in Arabic language version.
Her feast day commemorates both the movement of her relics to Eichstatt and her canonization, both of which occurred on May 1.
Walpurgis Night, named for St. Walpurga (d. A.D. 777), an English saint whose feast day falls on May Day, is the evening of 30 April (May Day eve) when, as was widely held--particularly during medieval and Renaissance times--witches celebrate a sabbath. Still today there are places where bonfires are kept burning all night to repel the evil spirits.
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