(Classical Music Agenda by DCist contributor Charles T. Downey of Ionarts) We hope you did your civic duty and Took a Friend to the Orchestra (as mandated by Drew McManus at Adaptistration and mentioned in our missive last week), because it will get more difficult now. In the first part of May, it seemed like we had a concert to see at least once a day (and sometimes we needed to bilocate to be fully…