This weekend, U2 brought their 'Innocence and Experience' tour to the Pepsi Center in Denver. One of the highlights of Saturday night's show came during the encore when Bono recalled the night the band filmed their now legendary concert film U2 Live at Red Rocks: Under a Blood Red Sky.

Coincidentally, this weekend marked the 32nd anniversary of the concert on June 5, 1983. According to Bono, the show was almost cancelled by longtime Denver area concert promo Barry Fey. At the time, the band had spent a great deal of money hiring a film crew to document their performance.

That afternoon, a series of thunderstorms rolled into the area, threatening to delay or even postpone the concert. It was only after the band pleaded with Fey that he allowed to the show to go on. By Bono's own admission, the inclement weather kept most fans home that night. That's when the band discovered 'the miracle of the wide angle lens'.

Of course, the foggy gloamin' that settled over the venue's iconic red rock cliffs that evening proved to be an ideal backdrop for the band's 'Sunday Bloody Sunday', which became an MTV staple and established the group as global superstars.

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