I am traveling from Toronto to Hong Kong then catch ferry toZhuhai will stay for meetings

will catch ferry to Zhuha on Thursday and have meetings starting Friday back to Hong Kong by Ferry Monday
I will return To Hong Kong on Monday, do I require a visa?
I will be visting Hopeful Technogies.
I will return back to Canada on Tuesday
I am not sure what week end but will be over week end then back to Canada
Thank you,