Not sure, but these are one of the events that are less "official." They're still OFFICIAL events, they just aren't directly managed by Pokemon or Nintendo, I don't think.
There hasn't been any news about these on the official Pokemon websites, only on the JR Kyushu site. Very similar to the ANA events, etc.
Perhaps that choice was made on the JR side? Or, perhaps this will be a new trend for all/most/some events from now on?