CHICAGO — Harry Styles has postponed his first concert in Chicago at the United Center, according to posts on social media, due to illness among the band and crew. A tweet by the United Center shortly before 3 p.m. advised: “Out of an abundance of caution, tonight’s Harry Styles show on Thursday, October 6, 2022 at United Center has been rescheduled to Monday, October 10, 2022 due to band/crew illness. … All previously purchased tickets will be honored for the new date. All additional show dates will play as scheduled. An email from Ticketmaster will be sent directly to ticket holders with m…