The 1974 Quidditch World Cup tournament was famous for the attempt by the ICWQC International Director, Royston Idlewind, to ban crowd members from carrying wands. A very noisy musical instrument, the Dissimulator, became a feature of every game. As Idlewind sat down in the box before the final match (Syrian National Team v Madagascar National Team), the real purpose of the Dissimulators was revealed (Pm).
At the Muggle football FIFA World Cup 2010 held in South Africa, the television coverage was disrupted by the noise of the crowd's colourful Vuvuzela horns. The Dissimulator seems to be the wizarding equivalent of this "musical" instrument (Wikipedia: Vuvuzela).