As I advised another out-of-town mongerer visiting, most of us within our discrete and small community here do not wish to attract attention, and actually prefer to be anonymous to each other even though there are exceptions from time to time. I think you may find it hard to get a local Hong Kong monger or to agree to hang out and show you the ropes. This site has a wealth of information an pretty soon you will become an expert on the activity.
Keep on mongering