The FIDE Handbook has a section called Regulations on Seminars & Title Award for Organizers where it describes what you need to do to get the FIDE International Organizer title. It says:
Scope / Mission: To get the FIDE licence for the organisation of FIDE, Continental and International tournaments.
Now, I know that the title is not a requirement to organize a low level FIDE rated tournament because I have done so in my club along with another player who also has no organizer title.
My question is: is it a requirement for high level tournaments and if so, where is the border between requiring the title and not needing it?