Local residents have complained of being kept awake by the "extreme noise" coming from a huge rave at a disused RAF air base near Bath.
Police are still trying to clear crowds from the area, after being called to the scene at RAF Charmy Down on Saturday night following noise complaints.
Tanya Rich, who lives about eight miles from the former air base, told the Standard that she was "bothered by the extreme noise level" and was "awakened at 5" with "no respite".
Ms Rich continued: "It got louder from 4am. I got woken up at 5. I think the police should have stopped it in the first place. The organisers were clearly not intimidated or worried by the police presence.
"We are still in the midst of a pandemic. It is the thoughtless attitude of people that will make this disease spike again. I understand people want to let off steam, so do we all! But allowing these raves to go on undermines all that the rest of us are trying to do to save the NHS resources, and to reduce our chances of catching Covid.
"And now...loads of cars parked illegally on the A46. The farmer who's cows all got out because of the fences and hedges the attendees trampled, and hardworking people who needed a lie-in getting told they are just moaners by a small faction of 'yoof'!"
Avon and Somerset Police said the organisers were "selfish" for putting on the event despite "the ongoing risk to public health".
Officers were alerted to the gathering just after 11pm on Saturday. They found thousands of people on the site and decided not to break up the rave because "the potential risks to public safety of an intervention to close an event attended by more than 3,000 people in dark and wet conditions were too great".
They added in a statement: "Officers closed off the approach routes, however people were abandoning vehicles and making their way to the site on foot.
"Officers were still turning vehicles away at 6.40am on Sunday.
"There were also other significant incidents across the force area including 120 999 calls which required an immediate police response and the attention of our resources. Therefore the decision was taken to contain the event until daylight hours."
Chief Superintendent Ian Wylie said police are trying "to close down this event in a controlled way".
He added: "We're sorry for the disruption caused to so many residents by the selfish actions of the organisers of this event and those attending, knowing the problems it would cause and the ongoing risk to public health of large gatherings due to Covid-19.
"We will take appropriate action against those responsible."
