Shenzhen is adjacent to Hong Kong . You can take train, bus or ferry going between Hong Kong and Shenzhen, which take about 1 hour. It just takes 10 minutes from Huanggang Port to Shenzhen Convention & Exhibition Center by Metro and 15 minutes from Luohu Custom.

A•  Hong Kong Airport [ by Airport Express ] → Tsing Yi [ by Metro ] → Lai King Station [ by Metro ( Tsuen Wan Line)] → Prince Edward / Mong Kok Station [ by Metro (Kwun Tong Line)] → Kowloon Tong Station [ by train ] → Shenzhen Railway Station [ Luohu Custom)( by Metro (Line 1)] → Shenzhen Convention & Exhibition Center (= Shenzhen Huizhan zhongxin)

B•  Hong Kong Airport [ by Airport Express ] → Tsing Yi [ by Metro ] → Lai King Station [ by Metro ( Tsuen Wan Line) ] → Tsim Sha Tsui Station [ by car or on foot ] Tsim Sha Tsui Railway Station [ by train ] → Shenzhen Railway Station (Luohu Custom) [ by Metro (Line 1)] → Shenzhen Convention & Exhibition Center (= Shenzhen Huizhan zhongxin)

C• Hong Kong Airport [ by bus ] → Shenzhen Huanggang Port [ by Metro (Line 4) ] → Shenzhen Convention & Exhibition Center (= Shenzhen Huizhan zhongxin)

Please note:
Chinese pronunciation of Shenzhen Convention & Exhibition Center is “Shenzhen Huizhan Zhongxin”