We’re gobsmacked that we forgot to mention Tim “Make it Work” Gunn’s planned whirlwind visit to the District this weekend. A native of Washington, he’s a veteran of Corcoran College of Art + Design and hit the big time as a mentor to aspiring designers on Bravo’s oddly addictive Project Runway. Along with co-author Kate Moloney, Gunn comes to town promoting his new fashion manifesto, Tim Gunn: A Guide to Quality, Taste, and Style….