Do we need visa to HK for a 6 days' conference?

You are required to hold a valid visa for the HKSAR. And if apply for visa to visit/transit HK for the first time, should apply directly to the Immigration Department of the Hong Kong Special Administrative Region (HKSAR). Documentsneeded are: HK Visit/Transit Visa Application Form, one recent passport-photo size color photograph, one photocopy of the passport page containing the personal particulars, proof of the financial standing (e.g. bank statements, salary certificate issued by the company), air tickets booking, etc. Besides, you should also provide a note issued by the Ministry of Foreign Affairs of the Government of Nepal for visa application.