Youtube video inside the "Electric Daisy Carnival" is making its way around the web.
Those who attended say it was a great concert.
"It was amazing. Probably the best concert I've ever went to in my life as far as the music I listen to. I enjoyed it. It was awesome", said one person who was there.
But make no mistake. This was a rave. But it's promoted to hi-light the music and the light show.
"The proper term now is electric dance music festival because there is a lot more that goes into it”, said Clark McCaskill who also attended.
McCaskill and other patrons tell us they did not participate in any drug use but say it's common at the event.
"Of course, going in you know that's what it's used for", one said.
"Drugs are a part of this festival just like drugs are a part of any concert. If you go to a rock concert or a rap concert, you're going to smell marijuana in the air", McCaskill said.
They tell us security was tight and police searches were thorough.
Still, 30 people were taken to the hospital mostly for drug related calls including 19 year old Andrew Graf who later died.
"They promote this as a drug free environment yet some people still find ways to sneak drugs in and it's unfortunate", McCaskill said.
Drug counselor David Burkett says these types of parties have now gone commercial to make money but drug use, especially ecstasy are always involved.
"They've been around for quite some time. And they just evolve. They have different names come onto them. And they just get kind of a following to them", Burkett said.
The same party held in Dallas last year was called a success, but a party in Los Angeles left a 15 year old girl dead. Burkett says these two deaths should send a message to Dallas city leaders.
"I think you have to go back and you have to look at this a little more carefully about what could be done differently. You know look at your risk management factors", Burkett said.