A visit to Chatsworth will find you caught up in the excitement of the movie “The Duchess,” starring Keira Knightley, opening in the UK on September 5, and in the US on September 19.  The exhibit devoted to Georgiana Cavendish will be on display through October 31, and will include portraits [ one painted by Thomas Gainsborough ], family archives and costumes from the film, which was partially shot at the historic house.  At the Chatsworth website, you can also enter a contest and win a weekend at the House, complete with Tea and walking tours of the house and gardens….