Belgian festival Tomorrowland hosted 400,000 ravers in 2017, and have added a second weekend for 2018. Even with the additional dates, tickets sold out in just one hour.
Running since 2005, this years event will run 20th-22nd July and 27th-29th July, stages include Anjunabeats, Drumcode, Monstercat, Cocoon and the Mainstage among others and will see performances by hundreds of DJs including Carl Cox, Steve Aoki, Adam Beyer, Dimitri Vegas & Like Mike, Sven Vath and Above & Beyond.