White Sensation used to be a trance event, but in later years it has become a pure house event. All the attendees are required to wear white and the Amsterdam ArenA itself is decorated to match. Sensation White's slogan is "Be Part Of The Night - Dress in White". Every event has around 40,000-45,000 tickets available. The Amsterdam ArenA event takes place every year on the first Saturday in July while the German event in the LTU Arena in Düsseldorf is held on New Year's Eve. In 2009 it was organized for the first time on two subsequent nights on 3 and 4 July in the Amsterdam Arena where the opening of the Wicked Wonderland took place. Notable DJs that have appeared at Sensation include Tiësto, Armin van Buuren, Swedish House Mafia, André Tanneberger, Darren Emerson (one of the Underworld members), David Guetta, Erick E, Erick Morillo, Ferry Corsten, Marco V, Paul van Dyk, Johan Gielen, Sander Kleinenberg, Steve Angello, Fedde Le Grand, Sebastian Ingrosso, Sander van Doorn, Mason, Felix Da Housecat, Laidback Luke , Tocadisco and Rank 1. The event has recently been criticized by trance fans who think there is too much house and electro and too few trance DJs in the recent events[citation needed]. However, in the eyes of the organizers, the popularity of trance has been receding in the past few years, and therefore Sensation White has adapted to this by altering its programming to add house and electro house. Nonetheless, the popularity of trance and indeed the DJs associated with the genre still seem to be a major force in Europe. Trance Energy, with over 30,000 people, has been selling out faster than ever before. In the 2008 edition of Sensation, there was only one (former) trance DJ present in the line-up: Marco V. In 2009, trance was left out completely in favor of house (classics) and techno, however the music of the 2009 Amsterdam event turned out to be more trance like again. In 2010, Sensation, to enforce the notion that they are now a House event, came up with the theme "Celebrate Life with House". It featured performances by Chuckie, Swedish House Mafia, Sunnery James and Ryan Marciano, and Joris Voorn & 2000 And One. The event became exclusively a party for house music. This change in genre caused that for the first time since 2000, the tickets did not sell out the same day they went on sale, as audiences are much more demanding. In the end, about 35,000 people attended the festival held July 3. To create interest in the now House event, Sensation came up with a contest where the fans, via the social networks, would vote for their favorite theme and make it the anthem for 2010. The competing songs, featuring a selection of house and minimal themes, were not well received by Sensation followers and the competition was eventually cancelled. During the main event in Amsterdam, Sensation decided to go back to its origins, by playing their trademark anthem "Superstring", reminding its fans that although it is now a House event, it stays true to its origins.