Turns out there is a 'hold' on the T-Mobile Arena in Vegas June 10th for the Floyd Mayweather v Conor McGregor boxing match:

http://www.dailystar.co.uk/sport/ufc/596...-Vegas-UFC-News

Even Dana White thinks it will happen now. A month ago, a couple of days before the Super Bowl game, he said that there was a bigger chance of him being Tom Brady's backup quarterback.

http://www.espn.com/mma/story/_/id/18919...mcgregor-happen