They did that one time...
That was at the Meet and Greet before GW5 in Raliegh. Here is what Groundspeak says:
Mega-Events are a special designation reserved for only the largest event caches – those which attract geocachers to attend on a regional, national or international level. To qualify as a Mega-Event, the organizers must obtain prior approval from Groundspeak – not from their volunteer cache reviewer. Among other requirements, the organizers must demonstrate a substantial likelihood that at least 500 people will attend the event. A Mega-Event Cache may be published up to one year prior to the event date. A regular Event Cache can be changed to a Mega-Event Cache after the fact, if the organizers demonstrate to Groundspeak that more than 500 people attended.
You confirmed what I suspected
I really had wanted to make it to that event as well. Just wasn't in the cards for it to work out this time. I too really want to get over there to cache, and to see the province.