Police have been called to four unlicensed raves across Norfolk.
Norfolk Police officers were called to the first event at a disused quarry in West Lexham, just outside Swaffham, at 2200 BST on Saturday.
Police found 30 to 40 people at the venue with a large convoy of vehicles. The party goers dispersed peacefully after being ordered to by officers.
Officers were also alerted to events at East Harling, West Harling and at Wroxley House, Yarmouth Road, Norwich.
At East Harling, Norfolk Police issued a dispersal order and the revellers moved to Dower House in West Harling where more than 3000 people gathered in a forestry area at 2300 BST.
Police said on Sunday that a number of people remain at the site on Sunday morning.
The fourth event at Wroxley House saw "several hundred people gathered with music systems at midnight" on Saturday, police said.
By Sunday morning many of the people had left the premises.