Seems like more events are likely to be added soon, a US centered one : Thanksgiving.
As we have so many EU centered one (Midsummer, Brewfest) a US one seems pretty obvious to add. I really dont mind, as long as I get pets or cookingrecipes!
Pirates day and Day of the dead seems to have one achievement each so far so Im highly doubting that they will count for the Meta. Darl is poking around on testrealm and I guess Ill do the same soon!