DC area bars are scaring up drink specials, pop-up events, and ghoulish vibes to celebrate Halloween. Here’s where to get your spook on:. Black Lagoon-the self-described “Halloween cocktail pop-up of your nightmares”-is now in its fourth year and will take over 35 bars across North America this month, including a return to Navy Yard’s Trouble Bird. From Tuesday, October 8 to Saturday, November 2, visitors can party with the pop-up’s upside-down neon crosses and pentagram decor while sipping on a variety of themed cocktails and shots.