Over the years, the size of Wacken Open Air has grown continuously, and now dozens of bands and tens of thousands of visitors flock to the festival. Even though the organisers said in 2006 that 62,500 visitors were "the limit of what is possible", changes were made to the structure of the festival grounds the following year by allocating a larger area to the "Party Stage". In addition, tickets could no longer be purchased directly on the festival grounds to reduce the number of spontaneous or ticketless visitors. In 2007 and 2008, the festival had already sold out as a result of advance ticket sales; for W:O:A 2009, tickets had even sold out by the end of 2008. The tickets for 2010, too, sold out months in advance.