The two people who died after falling ill at Mutiny Festival have been named as an 18-year-old woman and a recent father.
Georgia Jones, 18, and 20-year-old Tommy Cowan were both named locally as those who died after being taken to hospital from the Portsmouth event on Saturday night.
They were among 15 revellers admitted to Queen Alexandra Hospital from Mutiny that night, with organisers issuing a warning of a "high strength or bad batch" of drugs.
A spokeswoman for the hospital said it was believed they were admitted after falling ill from the effects of drugs. Another person remains in a critical condition.
Jones' mother Janine Milburn posted on Facebook that she "made the decision to turn everything off" after her daughter suffered ill effects because of the drugs.
"I hope this stops at least some of you from ending up the same," she wrote.
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Both of those named as victims were from Havant, Hampshire, and the second day of the festival, which Craig David and Sean Paul were due to headline, was cancelled.
Police said the woman was taken ill at the festival in King George V Playing Fields at 7.10pm before the man was found collapsed 20 minutes later.
A further 12 concert-goers went to the hospital on Saturday, but their cases were "not necessarily all drugs-related", the hospital spokeswoman said.
Three more attended on Sunday morning to be treated for injuries sustained in assaults or because of alcohol-related intoxication, the spokeswoman added.
Hampshire Constabulary is investigating but said the deaths were separate incidents and were not suspicious.
Anyone with information should contact police on 101.