Its a festival of some sort i believe.
according to wiki
Walpurgis Night (
/vælˈpʊərɡɪs, vɑːl-, -ˈpɜːr-/)
[3][4], an abbreviation of
Saint Walpurgis Night (from the
German Sankt Walpurgisnacht [saŋkt valˈpʊʁɡɪsˌnaxt]), also known as
Saint Walpurga's Eve (alternatively spelled
Saint Walburga's Eve), is the
eve of the
Christian feast day of
Saint Walpurga, an 8th-century
abbess in
Francia, and is celebrated on the night of 30 April and the day of 1 May.
[5][6] This feast commemorates the
canonization of Saint Walpurga and the movement of her relics to
Eichstätt, both of which occurred on 1 May 870.
[7]
Saint Walpurga was hailed by the Christians of Germany for battling "pest, rabies and whooping cough, as well as against
witchcraft."
[8] Christians
prayed to
God through the
intercession of Saint Walpurga in order to protect themselves from witchcraft,
[9][8][10] as Saint Walpurga was successful in
converting the local populace to Christianity.
[11] In parts of Christendom, people continue to light bonfires on Saint Walpurga's Eve in order to ward off
evil spirits and
witches.
[1][12] Others have historically made
Christian pilgrimages to Saint Walburga's tomb in
Eichstätt on the Feast of Saint Walburga, often obtaining vials of
Saint Walburga's oil.
[2][13]
Local variants of Walpurgis Night are observed throughout Northern and Central
Europe in the
Netherlands,
Germany, the
Czech Republic,
Slovakia,
Slovenia,
Sweden,
Lithuania,
Finland, and
Estonia. In
Denmark and
Norway, the tradition with bonfires to ward off the witches is observed as
Saint John's Eve.
[12]
en.wikipedia.org