Well, the generic term is "Planner" which has been in use for ages. "Event Director" or "Event Planning Director" emphasizes the individual's role as a section supervisor, which means that he manages all the event planners as well.
The terminology might change over time (i.e. for FFXIII-2, Square Enix renamed Map Planner to Level Designer, which is in line with western convention. "Main Programmer" has also been called "Programming Director" or "Programming Supervisor" in some games, which are more accurate terms), but for an RPG, someone is probably fulfilling the responsibilities of an event director.