U2 reschedules its prevously postponed Denver date, Rihanna cancels show this Thursday

​A few weeks before U2 was slated to come to the States for another leg of its 360° tour, Bono injured his back while preparing for the dates and had to have emergency surgery, which resulted in the postponement of a number of US dates, including the June 12 show at Invesco Field.

Live Nation sent word earlier today that the show has been rescheduled for Saturday, May 21 and all tickets from the previously scheduled show will be honored at the door. Refunds, if required, are available at point of purchase.

A number of dates on Rihanna's Last Girl on Earth tour, meanwhile, have been canceled reportedly due to scheduling conflicts, including her upcoming show with Ke$ha this Thursday, July 15 at Comfort Dental Amphitheatre. Rolling Stone magazine reports that the cancellations may have been due to soft sales. Refunds are available at point of purchase.