Mainland Chinese tourists are loosening their purse strings as they flock to Hong Kong on the first day of their National Day holiday, with many opting to stay for a few days to enjoy the fireworks, outdoor attractions and urban vibes. Hong Kong authorities estimated that as many as 1.54 million mainland visitors, including 1,200 tour groups, would come over the eight-day “golden week” holiday, which coincides with National Day and the Mid-Autumn Festival. The estimate marked an increase of 11...