Many countries do not require a travel visa to visit Hong Kong for visits under a specified length of time but requirements are different for each country. Please check your specific visa requirements here. SeaWeb will only provide registered attendees with invitation letters for visas to Hong Kong and requests must be made a minimum of 30 days prior to the conference.
Visa requirements for Mainland China are different; if you plan on visiting the mainland during your travel to the Summit please check your visa requirements, as many countries, including the United States and European Union, require visas.