The 50,000-seat Kai Tak Stadium is transforming Hong Kong into a major sports and events destination, as it drives repeat tourism, supports retailers and helps prop up the city’s retail property landlords, according to experts. It served as the venue for British rock band Coldplay’s four-night concert in April and K-pop girl group Twice’s first-ever shows in the city earlier this month. A three-night gig by K-pop sensation Blackpink will also be held there next month. The stadium has been ranked...