http://music.msn.com/music/article.aspx?news=874895&ocid=ansent11
Most of the people with medical problems were outside the concert, not inside. The bouncers would not let them in because they appeared to be intoxicated.
That said, many of the drugs popular with teh EDM crowd give you a fever (the media usually says “raises the body temperature”). Combine that with a high ambient and no readily available water, you have a problem.
I went to a dance concert and there was a pile of 16 oz water bottles, a big pile, and it was gone by the halfway point!
I have heard the beat but am not too familiar with the overall concept. Are there vocals or is it mainly computerized repetitive words played.