Final Fantasy: Square Enix Japan to Host 5th Anniversary Party?

While browsing the web today, I came upon a site saying that in the next September, Square Enix Japan will be hosting a party to celebrate FFXI's 5th Anniversary. So far no news have been given as if the party will be held elsewhere in the world as well.

If you are curious about it and can read Japanese, feel free to check the website:
http://www.playonline.com/ff11/event/sep2007/