From Philly.com: "Police are investigating the deaths of two men, identified as Raymond Guarino, 26, of Forked River and Patrick Norris, 24, of Coram, NY. After possibly taking drugs and alcohol, both passed out in separate incidents at the concert, went into cardiac arrest and later died. State Police said the men were believed to have ingested cocaine, marijuana and alcohol prior to their deaths. Troopers who searched Gaurino's vehicle found small amounts of both drugs"
From Blabbermouth: "...more than 80 people were arrested at the concert, including several for underage drinking and drug possession, as well as some for assault, resisting arrest and defiant trespass."