Hermes does have sales though it is not held at its store;
For Winter 2008 it was at Palais des Congres (Porte Maillot) Hall Neuilly 9th -12th January 2008. Same location for the Summer 2008 (25-28 June 2008)
In 2007 it was held at salle Gaveau 45 rue de la Boétie from the 15th to the 19 th 2007 ( Spring-Summer 2006 collection sale)