It’s round two of the official opening of the fall art season. If you didn’t get to check out all the openings last week (and who humanly could have?), spend part of your Saturday afternoon perusing the rest — our reviewer particularly enjoyed the show at Flashpoint. But block off your evenings for the parties to celebrate the following openings: >> Up in Bethesda, it’s the big night for the Trawick Prize finalists, as they…