We might not doing anything official for WTCQD this year at this point due to scheduling conflicts, but check out the Bill Douglas' official site. It's been updated and has this cool events map.

World Tai Chi Day Events Around the World
Hover over one of the markers (it takes a while) and the name and location of the event will appear. These events are from previous years (and not every event is listed) for illustration purposes only. Use the search above to find current events. (Someday, we will get the current listings in a map like below, but for now you will have to live with a text listing by country and state or province.)
It's a little buggy so if you visit the site, click 'events' on the topmost nav bar to see the map.