Here in the US, it's not yet Talk Like a Pirate Day (that happens on September 19th every year), but over in Oceania, it's already been 9/19 for a few hours, and players have discovered some scurvy-ridden sea dogs in Booty Bay celebrating the event. Apparently, there are a bevy of pirates (what do you call a group of pirates exactly?) hanging out above the Inn there, and their leader is Captain Demeza, who will give you a 12-hour buff that makes you look like a pirate. We're also told that her commoner cronies are hanging around the capital cities, so talking to any pirate should give you the buff.
Kisirani confirms that the holiday is new, and that while yes, it only lasts for one day (which means weekend warriors won't have a chance to see the proceedings), there are no lasting rewards to be found, just that 12-hour buff (which itself is just cosmetic anyway). So happy TLAP day, maties!*
*Yes, you landlubbers, I can do a better pirate than just "maties." But it's not September 19th here in the US yet. Stay tuned.