Police arrested seven people and seized two vehicles after a rave on farmland in Dunsby.
Between 200 and 300 people attended the rave which started at around 11pm on Saturday on land off Fen Road.
Police said there were insufficient resources on duty to disrupt the gathering safely while it was at its peak.
Officers entered the site and closed the rave down at about 2.30pm yesterday (Sunday).
Seven people were arrested and two cars and sound systems were seized.
Suspects are currently helping police with their inquiries.