This story has been made freely available as a public service to our readers. Please consider supporting SCMP’s journalism by subscribing. New users who download our updated app get a seven-day free trial. Hong Kong marks the 28th anniversary of its return to Chinese sovereignty on Tuesday. The day’s events start with a flag-raising ceremony at Golden Bauhinia Square in Wan Chai and a reception at the nearby Hong Kong Convention and Exhibition Centre, where Chief Executive John Lee Ka-chiu will...