Celebrity Cruises is offering a free two-night cruise on the Constellation on Sept. 5, 2012 from Amsterdam to Southampton. In order to participate, travelers must book either Celebrity's 12-night Scandinavia and Russia Cruise departing Aug. 24, 2012 or the 12-night Immersive Europe Wine Cruise departing Sept. 7, 2012. Travelers have the choice of sailing before or after the English Channel cruise. To take advantage of this offer, bookings must be made by Dec. 16, 2011.