Hundreds of people are believed to have gathered at a rave in the Goyt Valley, near Buxton, last night.
Derbyshire Police said it received reports shortly before midnight of people descending on the area by train, car and minibus.
A spokesperson said: “Officers were deployed to the area to ensure the event passed peacefully.”
Police monitored the event, which continued into Sunday morning, and remained at the scene until its conclusion.
Officers dealt with only “minor incidents”, the spokesperson added.