A 34-year-old activist admitted in court Tuesday to discussing a plot to disrupt an inaugural ball for Trump supporters with an acid attack inside the National Press Club in downtown Washington.Scott R. Charney, of Northwest Washington, pleaded guilty in D.C. Superior Court to conspiracy to commit assault, a misdemeanor. In an agreement with prosecutors, the criminal record will be expunged if he performs 48 hours of community service.The arrest of Charney hours ahead of the Jan. 19 DeploraBall attracted national attention, with police saying they had successfully foiled a dangerous plan to spread butyric acid through the press club’s ventilation...