The first edition of the festival took place in 2005 on August 14. Performers included Push (M.I.K.E.), Armin van Buuren, Cor Fijneman, Yves Deruyter
The second festival, on July 30, 2006, hosted Armin van Buuren, David Guetta, Fred Baker, DJ Zany, Ruthless, skrillex ,and Marco Bailey. The DJ and producer Paul Oakenfold was also announced on the poster, but canceled at the last moment, as he was on tour with Madonna at the time.
The third year, the festival lasted two days for the first time in its history, taking place on July 28 and 29, 2007.
For the fifth event, ID&T led to even more venues, one ski, and much more. It has included an "I Love the 90's" stage, where musicians such as Push, Natural Born Deejays and SASH from the dance scene were present. La Rocca performed live at the event for the first time. The special act on the main stage was Moby. Tomorrowland 2009 took place on July 25 and 26 and attracted 80,000 people.
Tomorrowland sold out days before the event, with a record attendance of 120,000 visitors over two days.
2011 marked the festival's expansion to three days. Only a few days
after the official pre-sale of tickets kicked off, Tomorrowland was
completely sold out and had over 180,000 visitors. David Guetta, Nervo, Swedish House Mafia, Avicii, Tiësto, 2ManyDJ's, Carl Cox, Paul van Dyk,
Tensnake, Laidback Luke, Brodinski, De Jeugd Van Tegenwoordig, and
dozens of others performed. It was voted the best festival of its kind
in the world at the International Dance Music Awards in 2012.
Tomorrowland 2012 took place between from July 27–29, 2012, where the same number of DJ's came up, plus Dimitri Vegas, Steve Aoki and Pendulum, playing in fifteen different stages.