More than 100 people were arrested over the weekend at the V Festival in Chelmsford.
Essex Police said it had made 114 arrests, including 22 for drug dealing.
There were 75 arrests for drug possession, six for assaults, one for disqualified driving, two for theft, two for rowdy and disorderly behaviour, three for fraud and three for drink-driving.
Chief Supt Andy Prophet said all the officers had done "a great job" to make the event safe.
He added: "The work of our drugs dogs in sniffing out those in supplying drugs has been a key element in our tactics this year and its one that has worked really well.”
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After a mostly dry start, cloud will continue to thicken with some showery rain likely this afternoon. Highs of 18 deg C (64 deg F).
Tributes have been pouring in for a woman who died in a house fire in West Norfolk.
Any residual evening showers should die out. Clear spells at first, and turning chilly in places. Lows of 9 deg C (48 deg F).