Walpurgis Night ("Valborgsmässoafton" in Swedish, "Vappu" in Finnish, "Volbriöö" in Estonian, "Valpurģu nakts" or "Valpurģi" in Latvian, "Walpurgisnacht" in German), "Čarodějnice" in Czech is a holiday celebrated on April 30 or May 1, in Finland, Sweden, Bohemia (Czech Republic), Estonia, Latvia and Germany.