The operator of Hong Kong’s Kai Tak Stadium has said it will implement measures to ensure the safety of concertgoers after thousands of fans of K-pop girl group Blackpink queued overnight and pushed to reach the standing area of the 50,000-seat venue. Clips posted on social media on Saturday night show the crowd jostling to get into the stadium on the first night of the band’s three shows in the city, with people heard shouting “don’t push” and even screaming. Another clip shows “Blinks” – the...