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a. The eve of May Day, observed in some European countries and in some Scandinavian communities in the United States in celebration of spring and marked by music, singing, and bonfires.
b. The eve of Beltane, believed by medieval Christians to be the occasion of a witches' Sabbath.
2. An episode or a situation having the quality of nightmarish wildness.
[Partial translation of German Walpurgisnacht : Walpurgis, Saint Walpurga (died 779) + Nacht, night.]
(Alternative Belief Systems) the eve of May 1, believed in German folklore to be the night of a witches' sabbath on the Brocken, in the Harz Mountains
[C19: translation of German Walpurgisnacht, the eve of the feast day of St Walpurga, 8th-century abbess in Germany]
Wal•pur′gis Night′(vɑlˈpʊər gɪs)
(in German folklore and literature) the evening preceding the 1st of May, when a witches' Sabbath was held on the Brocken.German, Wal•pur•gis•nacht (vɑlˈpʊr gɪsˌnɑxt)
[after St. Walpurgis (c710–780), Anglo-Saxon abbess in Germany, whose relics were enshrined on May 1]