Dance music festivals already already bear a large risk overheating their patrons. The hours dancing, especially in the Summer, is bad enough. Obviously those risks are amplified with any illicit substances. Those attending this weekend need to be extra vigilant to stay hydrated, because the has issued an Excessive Heat Warning in Nevada.
From 11AMPDT on Saturday to 9PM Wednesday there will be temperatures 110-115 in the Las Vegas Valley and other low desert areas. The warning mentions that at those temperatures heat illnesses are possible. The National Weather Service urges all people, not just those at EDC, to drink plenty fluids and stay out the sun as much as possible.
Thankfully EDC takes place only at night, but the minimum nighttime low will only be about 75 degrees. It might be said all the time with festivals, but stay hydrated with a camelback and watch out for eachother.