Massive holiday crowds and immigration bottlenecks overwhelmed Hong Kong’s newly revamped Huanggang Port on Sunday, prompting authorities to issue their first “busy” alert just six days after the border crossing reopened. The 24-hour land crossing between Hong Kong and mainland China, which reopened on October 12, logged over 130,000 passenger trips on Saturday as it kicked off its opening weekend alongside the three-day Chung Yeung Festival holiday, according to official data. Outbound...