Each year, the Ball of the Viennese Chimney Sweeps kicks off the ball season. If you're wondering about this ball: in Vienna, it is quite normal for virtually every professional guild to have its own ball. They range from the Confectioners' Ball to the Ball of the Weightlifters. An especially large number of balls are held at the Imperial Palace in Vienna. These traditional balls adhere to a festive ceremonial pattern. The ladies appear in a long evening gown, the men wear a tuxedo or tails. Young ladies in white dresses and their gentlemen open the ball with a polonaise; the rest of the visitors are only allowed on the dance floor after the proclamation "Alles Walzer!" (Let the waltz begin!). Further show acts and interludes give structure to the night. This includes the popular "Fledermaus" quadrille by Johann Strauss. This is performed by the public to the instructions of a dance master and ends to everyone's amusement in a complete muddle.