Talk like a Pirate Day
"You have only a short while to prepare for one of the most popular unusual holidays, Talk Like A Pirate Day. This international holiday encourages you to add a bit of “yaarr” to “yaaarrr daily routine.” On 19 September each year, feel free to answer the phone in a heavy brogue, offer customers at your coffee shop an orange mocha to ward off the scurvy, or engage a public bus in a rousing chorus of 'A Pirate’s Life for Me'. "
So September 19th with an Aargh and a Yaarr! Carry on.