A German tourist allegedly in possession of 396 capsules was one of 62 people charged at Defqon.
Penrith police said more than 24,000 people attended the September 16 event, with 37 people charged for possessing drugs and eight charged with supply.
A 22-year-old German national in Australia on a working holiday visa was stopped by police about 4.50pm, and a search revealed he was in possession of several bags containing 396 capsules with a combined weight of 93.88 grams.
He was charged with supplying a prohibited drug and breaching bail conditions, and was remanded to appear in Penrith Local Court on September 22.
Eleven people at Defqon were issued with cannabis cautions, and one male was arrested for assault.
Traffic and highway patrol police conducted 450 roadside drug tests, with six positive results. Two drink driving charges were also laid, along with 30 infringement notices for various traffic offences.
Five medical transfers were completed as a result of misadventure or assault, and 280 clinical treatments were needed – six for intoxication and six for substance abuse, a Penrith police spokesman said.
“Overall the operation was a success,” the spokesman said.
“All the systems put into place by police worked well.”