More than 100,000 people attended the first day of the Electric Daisy Carnival at the Las Vegas Motor Speedway on Friday.
Police reported no fatalities reported and few arrests on Friday.
About 135,000 people attended the first day of the event, with 36 people removed. Police say there were about 193 medical calls, most of which were minor.
Triple-digit temperatures posed a problem in 2015.
Officials reported 1,400 medical calls and 27 people hospitalized during the three-night period. One person died of Ecstasy intoxication.
On the first night there were about 30 arrests including 22 narcotics-related felony arrests and six alcohol-related arrests.
More than 250 musicians are set to perform at the nocturnal event billed as the largest dance music event in North America.
Preview coverage of 2016 EDC included 20 new things at the music festival this year.
