Bangladeshi to attend meeting in HK

Andrew, the first step is to provide the required materials: copy of passport, application form, a passport-style photo, proof of financial support, hotel reservation, flight itinerary and invitation letter from the meeting.
Next step is to submit the application to the embassy of PRC to apply for the business visa. If the embassy deals with the application by itself, 4 working days are usually needed. But if the application is transferred to HK immigration department, 4 to 6 weeks are needed.