The best known Trance Festivals in the world are held in the Netherlands. They are mainly organized by three companies ID&T, UDC and Q-Dance :

* Trance Energy, Jaarbeurs, Utrecht (30 000 visitors) : The only festival which features only trance music, and very popular for diehard fans of trance. Many well-received DJs have played sets at this event, helping to create its fame. Organized by ID&T.

* Sensation, Amsterdam Arena (80 000 visitors on two nights). Not a trance-only festival, many genres such as house and hardstyle coexist. Famous for the venue (a football stadium) and the lightshow. Organized by ID&T.

* Armin Only, Ahoy, Rotterdam : The only DJ to mix at this event is the very popular Armin Van Buuren. Organized by UDC.

* Qlimax, Gelredome, Amhem (20 000 visitors) : A hardstyle, hardtrance event which has been gaining in popularity recently. Renowned for its impressive laser show. Organized by Q-Dance.

* Dance Valley, Netherlands : An outdoor festival organized by UDC.

Those festivals typically attract visitors from many European countries due to easy connections from rail and air of Dutch cities.

Many other countries lack such festivals due to legal restrictions. Public prosecution departments in many countries — notably France — have been reluctant to give permits for techno and trance events, due to perceived drug issues.


Source : http://en.wikipedia.org