Kindly note that the organizers cannot assist you with your visa applications and that each delegate is responsible for checking whether they require a visa and applying for one by themselves if they do.  The organizers can only assist to provide you with an invitation letter to use for your visa application if required

Step 1:  Check if you require a visa to enter Hong Kong SAR by clicking https://en.wikipedia.org/wiki/Visa_policy_of_Hong_Kong.  Note that this is a Wikipedia page and the organizer cannot confirm how up-to-date the information contained here is.

Step 2:  Submit your visa application either through a China embassy / consulate located nearest to you, or online with all the required supporting documents at https://www.immd.gov.hk/eng/services/index.html#tab_f_1.  Click on the first visa type shown on the page (Visit/Transit).  This is the visa type you need to apply for in order to attend the conference.  We cannot assist you with documents to apply for other visa types.  Follow the instructions online to complete your visa application.

Invitation Letter – this can be downloaded form inside the Registration area of this website. 
Go to Register Scroll down towards the bottom of the screen.  Click on Download Invitation Letter.