Organizers had arrived to set up before officers intervened and made a number of arrests, with equipment seized.
Police called it “irresponsible and completely unacceptable”.
Those who planned to attend were warned they faced being reported for Covid breaches if they visited the area.
Ch Insp Steve Readdie said: “Holding an event of this nature in the midst of a pandemic is irresponsible and completely unacceptable.
Under coronavirus rules, police have the power to shut down large parties – with fines of up to £10,000.
Source: Only Techno