In message , at 16:15:49 on Mon, 23
Jan 2017, Neil Williams remarked:

But what if I were to organise a meeting, booking a conference room,
greeting guests and holding a seminar (where I was speaking). Is that
closer to "work" than "business"?

It would depend on that country's rules, but typically it would be
about whether you were there to be paid to do a specific task (e.g.
hold a seminar), or if you were there to have discussions and do
presentations etc about something you are being paid to do while
elsewhere,

It's about half of each.

Paid to organise and hold the meeting, which is educating attendees
about things done by others elsewhere.

--
Roland Perry