Sacha Lord, who is the night-time economy adviser for the region, said those that had attended had put themselves and those they loved at risk.
Mr Lord tweeted: “I’ve seen some of the footage. You aren’t clubbers. Just selfish idiots.”
The MP for Ashton-Under-Lyne, Angela Rayner, said she had joined Oldham Street Angels at the Daisy Nook site during the rave.
The group offers support and pastoral care to partygoers and others that need it during the night-time.
Ms Rayner tweeted that she had “just finished my shift at Street Angels in Oldham” and had been “dealing with the illegal rave at Daisy Nook liaising with the police”.
Volunteers spent Sunday morning clearing away rubbish left scattered across the fields at the Daisy Nook site with help from Oldham Council.
Empty bottles, plastic bags, gas canisters and abandoned gazebos cluttered the beauty spot.