Pop music megastar Pink has postponed four shows in her U.S. tour, citing “reasons beyond my control.”. Pink made the announcement on social media, saying shows in Lincoln, Neb.; Sioux Falls, S.D., Milwaukee, Wis., and Des Moines, Iowa, all would be postponed. It’s the second time during this tour that Pink has suddenly postponed performing; in July, she canceled a show in Switzerland because of an unspecified health issue.