DJ Tiesto performs at the main stage on the first day of the Tomorrowland music festival on July 19, 2019, in Boom.

Tomorrowland 2019 is in full effect in Boom, Belgium, with a barrage of the dance world's biggest stars and more than 100,000 fans descending on one of the genre's biggest festivals.

On Friday, July 19 Tiesto played an homage to Avicii, The Chainsmokers closed the show and DJ Diesel, aka Shaquille O'Neil, went hard in the crowd.

Here are the 15 wildest Tweets from the first day of Tomorrowland.

Shaq raging at Tomorrowland ---- pic.twitter.com/ud88DmZBRS — Rave Moments (@Rave_Moments) July 19, 2019

when we were young we had “goals” that every aspiring DJ has thank you for making this one come true @tomorrowland ---- pic.twitter.com/XeUdxNTTMR — LOUD LUXURY (@LoudLuxury) July 20, 2019

This is my New Years Eve! Thank you so so so much @tomorrowland pic.twitter.com/LCeOIyw6PH — Neon Future Aoki (@steveaoki) July 20, 2019

For those of you that aren’t familiar with the Tomorrowland festival, it’s like Disneyland and Coachella had a wild bacchanalian baby. If any of that sounds of interest to you, you can check out my quick cameo in the midst of the madness... https://t.co/CQasxPSXoE pic.twitter.com/1Ged94SWOI — Darren Criss (@DarrenCriss) July 19, 2019