Final Fantasy XI is in its 10th year of service this year, and Square Enix will be celebrating through an event -- not an online event, a real life event.
The "A Decade of Final Fantasy XI Vana Festa 2012" event will be held on June 23 and June 24. The exact location of the event isn't clear yet, but based off the map Square Enix posted at the the event official site it appears to be in the Tokyo area.
Source:http://andriasang.co...03c/ffxi_event/
This seems interesting, too bad it's only in Japan.