Calls have emerged on social media urging Hongkongers in cities around the world to gather on Sunday to mark the third anniversary of clashes between police and protesters which launched the 2019 social unrest . According to posts shared on Telegram, rallies will be held in about 40 cities, mostly in Britain, the United States, Australia and Canada. Berlin, Prague, Copenhagen, Tokyo are also expected to host these gatherings. Activists held flags that read “Free Hong Kong, Revolution Now” during a rally in Taipei on Sunday to mark the 2019 unrest. A 10-minute video circulated on Telegram showed a large…