http://www.bbc.co.uk/news/uk-england-london-16743143

John King comments: As was widely reported, all Olympic venues will have to abide by Sunday trading laws.

But they will also have to abide by music licensing laws, which in the case of the premises licence of the Olympic Stadium, prevent the playing of music through the Stadium PA. The opening ceremony won't be much fun if the Live Music Act isn't enabled in time.