I've read around and it seems both cases are the speaking / doing seminars for a fee which they seem to take very seriously, which seems a bit odd to me.

1. Besides, a person permitted to enter Hong Kong as a visitor may also attend an event to deliver speech(es)/ presentation(s) subject to the following conditions being met:
   1. he/she will not be remunerated for speaking/presenting at the event (other than provision of accommodation, passage, meals, etc. relating to the event, or the reimbursement of such expenses);
   2. the duration of the whole event should be no longer than seven days; and
   3. he/she can only attend one such event to deliver speech(es)/presentation(s) during each period of permitted stay.