Oh my, Gosh! How did this sneak up on me?! The Apocalypse is right around the corner, and I haven't even thought about what to wear. Duh! How could this happen to somebody who has even read one of the Rapture series?
Just take a breath and calculate that this happens once a century. But ---
If you need to catch up quickly on the End of the World, here are some useful links:
Boston Globe Story link
Marketing the date, from movie and recording releases to t-shirts.
BetUS.com link posts odds on whether the end of the world will come.
And of course, there is Milliways, the Restaurant at the End of the Universe link in case you want to practice. This is a fabulously expensive restaurant perched in a time bubble allowing it to rock across the time at the end of the universe, again each night. You invest a penny in an account in your own time, and the miracle of compound interest enlarges your account to cover your evening's expenses by the time your arrive at the end of TIME. Enjoy your evening of fine food, fine wine, and a floorshow featuring the universe as we know it boiling away into the cosmic void.
Wikipedia on Apocalypse link
Which is where I got the admirable Albrecht Duerer's woodcut of the Four Horsemen of the Apocalypse.