Volunteers were forced to clear up a litter-strewn Royal Crescent in Bath after party-goers left rubbish on the lawn.
The unofficial party is understood to have been university students celebrating the end of exams.
However, they left without clearing cans, bottles, plastic bags and other litter.
Rob Harvey, one of those who helped clear up, said: "It took local residents to tidy the mess and make sure this national treasure could be viewed in its full beauty."
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