The event takes place over the weekend of 17-18 May in Bordeaux and, according to the UGS's website, which is helpfully in both English and French, offers tastings, dinners and vineyard visits, plus a golf tournament. At the main tasting on the Saturday, producers will be showing their 2005 vintage and one other (between 1997 and 2004).
For more information and to register, go to www.ugcb.net. You can register for the whole weekend or just one event.