The day has finally arrived — the official release of J.K. Rowling’s final installment in her Harry Potter book series, Harry Potter and the Deathly Hallows, is scheduled for midnight tonight (unless of course you received one of those magical early copies that have been floating around). For all you D.C. area Potter nerds out there (and as we already know, there are a whole lot of you) looking to celebrate tonight, here’s some area…