Up to 2000 people are expected to descend on Caloola Farm near Tharwa for this weekend's Psyfari festival.

Unlike past festivals, residents said the organisers have gone out of their way to keep them in the loop, even hiring a community liaison officer.

But the event will be the sixth "bush doof" at the venue in 18 months, run by different groups.

Documents released under freedom of information laws showed ACT Policing had expressed serious concerns about past events, even warning serious injury or death was "expected" if the events continued "unchecked and unregulated".

At the W3IRD festival in December 2016, police and government officials only found out about the event after an application to authorise fire twirling was lodged.

Because of the short notice, only two police officers attended the 900-people festival.

A police report said more than 90 per cent of attendees were drunk, including staff, and the presence of "illicit drug paraphernalia" was "rife".

A 17-year-old girl required medical care after overdosing on MDMA.

The only firefighting resources were used to turn the dance floor into a "bog-hole", and punters were encouraged to bring their dogs, which attacked and killed neighbouring stock and were allowed to roam in the Namadgi National Park next door.

Another festival over last year's Easter long weekend, Entropy, required police to change their rosters in order to provide roadside drug and alcohol breath testing around the event. A third of all drug drivers caught over that period originated from the Entropy Festival.

Licence checks showed the majority of attendees came from the Newcastle and Sydney regions and a large number of attendees delayed their return home to avoid the testing.

Several people were fined for public urination and cocaine and cannabis were seized.

The police report also said "open source intell" suggested "low level sexual assaults" were occurring at the event, although no official reports were made to police

Nearby residents have raised "significant" concerns about the events, exacerbated by the lack of mobile phone reception and poor accessibility.

Mandy Curtis said the festivals were in clear breach of Caloola Farm's rural lease, but she was told they were allowed to go ahead because they were private events.

"We've been fobbed off left, right and centre," Ms Curtis said.

"The lease has got a lot of holes in it."

The farm is on a 99-year concessional lease and is to be used as a conference camp to benefit the disadvantaged.

Its former owners, not-for-profit training providers Auswide, went into liquidation in 2014 and Deloitte were appointed administrators.

Ralph Hurst Meyers is listed in White Pages as the occupant of the farm, although Auswide were still listed on the title as of Tuesday.

Mr Hurst Meyers and Deloitte did not respond to requests for comment.

As well as the noise and the impact on the Naas River, Ms Curtis had grave concerns about what could happen to festivalgoers if anything went wrong

She said if there was a medical emergency, it was a 30-minute ambulance trip out there then 40-minutes to Canberra Hospital.

She also said if there was a fire, the only way out was a thin dirt track or a four-wheel-drive track through a neighbour's property.

"Caloola Place is not the farm for bush doofs, the access isn't good enough. We're concerned about the safety of people attending," Ms Curtis said.

Natalie Hogan said before the latest festival, locals would "get wind" of events about 48 hours out.

She found festivalgoers were found lighting fires on her property in December 2016, and had to cancel her holiday last Easter when she learnt another 1500 people were on the way for another festival.

"There's no way we're leaving our property, if a fire starts, we need to defend our property," Ms Hogan said.

Even police reports released under freedom of information sympathised with the frustration of local residents.

"If they'd known the Caloola lease could be used to generate significant revenue from illegal events they would simply have obtained the lease themselves and done so," one report reads.

"They see no reason why they shouldn't now breach their own leases and otherwise do whatever they wish with impunity. The reality is that their reasoning cannot at this time be contradicted."

A spokesman for Psyfari Festival said the event had a zero drugs policy but there would be first aid staff and harm minimisation group Dancewize onsite to ensure patron safety.

He said festival organisers had met with the ACT Ambulance Service and the Rural Fire Service to discuss concerns about accessibility in case of an emergency.

The spokesman also said entry conditions explained neighbouring properties were not to be entered, and security would enforce the policy.

"We always strive for keeping locals happy, and welcome them to attend or become involved in our events," he said.

"Our relationship with the neighbours and the local community where we previously held the event in NSW was so great in fact, that several families from there are travelling down to the ACT to attend at the new location.

The spokesman also said they had offered tickets to locals.

"There are eight households in the valley and six have expressed interest and accepted tickets. Four of these families are allowing their teenage kids to attend, including the same neighbours who are making these complaints."

An Access Canberra spokeswoman said private events on private property did not require government approval, but the government was "committed to Canberra being an event friendly city".

"The organiser of the event has been proactively working closely with all areas of government and agencies including, but not limited to: Access Canberra, ACT Policing, Emergency Services Agency, Health and Protection Service and the Environment Protection Authority. This cooperation commenced in August 2017," she said.

"All agencies on the working group have expressed a high level of confidence that risks have been identified and managed by the organisers - including reducing disruption to neighbouring residents."

An ACT Policing spokesman said police would be focusing on road safety around the event, as well as responding to any incidents.

"Police remind attendees to consider their own safety, look out for your mates and don't consider driving from the event if you are under the influence of drugs or alcohol," he said.