Hong Kong singer Gloria Tang Tsz-kei, known as G.E.M, has announced an additional show at the Kai Tak Stadium in August, after tickets for her three performances from August 15 to 17 were sold out within an hour on Friday. A Post reporter who visited the HK Ticketing website when sales opened observed that the cheapest seats for the Saturday and Sunday shows on August 16 and 17, which cost HK$680 (US$87) each, were sold out within three minutes. Despite the HK Ticketing website showing that most...