By Brandy McDonnell Features Writer bmcdonnell@oklahoman.com From fairs and festivals to rodeos and ballgames, Labor Day weekend offers one last chance to celebrate summer before autumn takes hold. The Oklahoma State Cowboy football team will be in Mount Pleasant, Mich., to take on the Central Michigan Chippewas on Thursday, while the University of Oklahoma Sooners are playing their season opener on the home gridiron in Norman on Saturday night versus Akron.