A crack down on illegal raves is underway with extra police officers on duty to carry out patrols in potential trouble spots.
Some planned events in Suffolk were foiled ahead of the Easter Bank Holiday and in Bury St Edmunds several arrests were made as an event was being set up.
Suffolk Police are asking people to make early reports of suspected events.
Supt Mike Shields said some events have been stopped before they got under way but they know others are being planned.
Police say they will search anyone attending a rave for drugs and will seek evidence of illegal drinking.
"We are taking this operation very seriously because of the dangers to public order and the welfare of those taking part," Supt Shields said.