The Off-Broadway smash hit The City of Conversation, a rousing story of a political family over three decades of change, makes its Atlanta premiere at Horizon Theatre Company.   Washington DC was once a place where people actually talked to each other... savvy maven Hester Ferris opens her home for political foes to lay down arms and raise a glass.  But that is all about the change. Colin, her beloved son, brings home a Reaganite girlfriend and a shocking new conservative world view rocking Hester's world.  Follow the Ferris family from the end of the Carter presidency through the Reagan era and into Obama's game-changing inauguration.