Rascal Flatts have postponed this weekend's shows due to illness, according to their website. They had been scheduled to perform in Sioux City, Iowa, on Thursday night (Jan. 17). That concert will now take place on Aug. 18. In addition, Friday's show in Tulsa, Okla., has been rescheduled for Aug. 10 and Saturday's stop in Wichita, Kan., has been moved to Aug. 9. The Band Perry, who are currently touring with Rascal Flatts' Changed tour, will perform on all of the rescheduled dates. Original tickets will be honored on the August dates.