No doubt D.C. area residents have already been enjoying their share of after work, al fresco drinking and dining this summer. That’s what summer’s for, and it actually hasn’t been bikram-yoga-studio-hot in the District much this summer, save an odd week or two. [Yes, I know, I probably just jinxed it. Code Red Air Quality alert here we come.] There’s still a few weeks left of summer proper, however, and even longer for summer-like weather,…