An update on BTS’ upcoming show “BTS The Comeback Live: Arirang” in central Seoul next month: Access to designated viewing areas for the concert will be limited to fans with advance tickets, organizers said, and the show will run for about one hour. Seoul police are preparing extensive crowd control measures amid expectations that attendance could reach 260,000. According to an announcement posted Friday on the global fan platform Weverse, entry to the main viewing zones for the one-hour event —