From 24Tix: DUE TO A MEDICAL EMERGENCY, TONIGHT'S INTERPOL PERFORMANCE HAS BEEN POSTPONED. RESCHEDULED DATE TO BE ANNOUNCED SOON.
Statement from Interpol: We have to postpone tonight’s concert in Salt Lake City due to one of us being ill and unable to perform this evening. We are very disappointed by this postponement and hope to be able to make up this date in the near future. We apologize profusely for the inconvenience and appreciate your understanding with this situation. Please hold on to your tickets and keep checking with the box office for updates. Our apologies, SLC. Sincerely, Interpol
Update: It was Sam who was ill. Hope you're feeling better now, Sam!