Drummer felt sudden urge to pee before performance
The shows will take place during May and June 2015
Band were among the favourites to play at next year's festival
Lindsey Buckingham says the band have been "exploring new turf"
Tickets snapped up in just 25 minutes
The band played the Target Centre in Minneapolis
Singer also confirms the band are now halfway through recording a new album
Songs feature Christine McVie and are '75 per cent done'
'24 Hours With Mick' will feature the drummer in conversation with famous friends
US album sales rise by 33 per cent following high-profile interviews