The most stressful holiday of the year has arrived. And no, we're not talking about Thanksgiving. (Hopefully you're just on dessert duty and can buy a pie last minute.) We're talking about Black Wednesday—the night when you return to a very scary place: high school. Don't be lame and sit out on the fun. Hit up your local bars with a vengeance, and look killer while doing it. Not sure what to wear? We've narrowed your look down to the scenarios you might encounter…