Chorley Police used their Facebook page to issue the warning.
They said: "This evening and over the weekend you will see an increased presence from Police and Partner agencies in the Rivington area.
"This is due to information we have received about a possible rave over the weekend in that area.
"The last time a rave occurred in the area it resulted in a number of Covid Tickets being issued and the sound equipment was seized.
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"Remember there are offences of gathering and proceeding to a gathering under the Criminal Justice and Public order act.
"With the help of United Utilities, Rivington Heritage Trust and North West 4x4 Response we have eyes everywhere."