Willie Nelson and Tim McGraw to headline Windy City Smokeout country music festival at the United Center.CHICAGO (WLS) -- The premier outdoor country music and BBQ festival in the country, will return to Chicago on August 4-7 at the United Center.Windy City Smokeout brings four days of food, music and craft beer for thousands to enjoy.Willie Nelson and Tim McGraw are this year's headliners. Tickets start at $45, and purchases after July 26th will be available at will call. Report a correction or typo