One Direction gigs force angry coders to cancel conference (telegraph.co.uk)

For clarity the original title was wrong and apparently updated by The Telegraph.

All of the hotels within 20 miles are mostly booked or have responded to demand by vastly raising their prices. Lots of event agencies buy these rooms to group up and sell on as packages.

I think Cardiff has roughly 6000 hotel rooms. The concert is expected to bring in 140,000 people.