Keith Urban and John Mayer, who are featured on a new episode of CMT Crossroads airing June 18, will share the bill during a special concert scheduled for Aug. 28 at the Gorge in George, Wash. Beginning Saturday (May 1) at 10 a.m. PT, fans will have the opportunity to purchase tickets before the general public by visiting the artists' websites -- www.JohnMayer.com and www.KeithUrban.net. Another pre-sale opportunity via CMT.com begins Monday (May 3) at 10 a.m. PT and runs through May 7 at 10 p.m. PT. Tickets will become available to the public on May 8th at 10 a.m. PT. "CMT Crossroads was the first time I performed with Keith, but the creative rapport was there right away," Mayer said. Urban added, "There's a certain simpatico between us as guitar players that, I think, comes from sharing the same desire to express the unwritten. Playing together at the Gorge will be like adding a musical score to the most magnificent setting in a film."