Mixologists and bartenders (and those who aspire to be them), take heed. More than $4000 can be yours if you shake it (a cocktail, that is). Double A, that den of sin lurking beneath Mercadito, will play host to the Double A Bar Joust competition — an all out, battle-to-the-death cocktailing brawl that will reward you with fame and a modest fortune. The whole thing even has its own video trailer. You don’t need to be a Dale DeGroff or even an Adam Seger to enter — being Joe Q. Barfly (and having a way with Angostura bitters) is fine. Just a modicum of experience will do, and deadline for entry, which you can do here, is today.