The two-day Rock Vegas festival is taking over Sin City on Sept. 28 and 29, and Loudwire is giving away a trip for two that includes tickets to the shows, roundtrip flights to Vegas and a two-night hotel stay. Not to mention, the winner also will receive a guitar signed by Stone Sour. The winner and a guest will be able to rock out to headliners Rob Zombie, Shinedown, Marilyn