Answer from Paris Digest, France
09:49 April 24, 2010
Jane, you are talking of the International Garden Festival at the Castle of Chaumont sur Loire near Blois. See http://www.domaine-chaumont.fr/index-en.php?page=festival&cat=102&expandable=2 . I am afraid there are no buses from Blois to Chaumont. You could either take a taxi in Blois or rent a car in Paris (two hours drive). Enjoy your stay in France.