Mumford & Sons concert sells out at Open House Festival

On Sunday the Open House Festival announced:

London’s nu-folk finest, Mumford & Sons [above], are to headline the festival on Monday 6 September with an opening night hoe-down in Custom House Square, Belfast. This latest announcement represents a major coup for the festival as Mumford & Sons are arguably one of the most successful British acts of the last 12 months. Tickets are on sale NOW for £25...

Today it is announced that the 2,000 tickets for the show have been sold out in 36 hours - a Coors Light Open House Festival record. What else could possibly be responsible except the 5-string banjo?