Hikers flocking to a popular geological attraction in Hong Kong’s Sai Kung over the Mid-Autumn Festival weekend have called for real-time displays showing when time slots are available under a trial registration system.A day after the large influx of visitors, the High Island Geo Trail’s Po Pin Chau section continued to draw lines of visitors on Saturday morning – the second day of an extended weekend in mainland China.While hikers who pre-booked a slot under a newly introduced trial...