High Quality Content by WIKIPEDIA articles! UFC 151: Jones vs. Henderson was a planned mixed martial arts event that was to be held by the Ultimate Fighting Championship on September 1, 2012 at the Mandalay Bay Events Center in Las Vegas, Nevada. It was to be headlined by a UFC Light Heavyweight Championship bout, between champion Jon Jones and former dual-division PRIDE FC and Strikeforce champion Dan Henderson. However, the event was cancelled on August 23, when the UFC announced Henderson was unable to fight due to injury, and Jones refused to take a replacement fight against longtime middleweight contender, Chael Sonnen.