About 150 people gathered for an illegal rave near Tickencote.
Police were called to land off Empingham Lane at about 12.30am yesterday (Sunday). Officers spoke to the rave organisers and negotiated a time for them to leave the area.
They closed roads to prevent more people getting to the rave and put out warnings on local radio as some people had been spotted crossing the A1.
No arrests were made.
A police spokesman said: “Officers would advise anyone who suspects an unauthorised music event is taking place or sees any suspicious activity in relation to such an event to please contact police.”