Swedes ,  Finns ,  Estonians , Latvians ,  Lithuanians ,  Czechs Type Cultural Date 30 April or 1 May Celebrations Bonfires ,  dancing Related to May Day ,  Beltane ,  Friday the 13th The current festival is, in most countries that celebrate it, named after  Saint Walburga  (ca. 710-777/9). As Walburga was