There is a tradition in the Czech Republic as well as some other nearby countries of burning an effigy of a witch on a bonfire on April 30. The event is known here as Čarodejnice and in German-speaking countries as Walpurgisnacht. There are so many bonfires that heat-sensitive satellite cameras can detect it from space, all around the Czech-German border and across Bohemia. Several Prague districts organize family-friendly events and there is also a large one at Žluté lázně, followed by an evening concert.
