The forum – made up of local councils in the UK, health boards and emergency service representatives – is appealing to owners following an incident where a rented farm was used to host an illegal rave-style party, in clear contravention of coronavirus rules.
Without swift police intervention, the numbers involved would likely have rapidly increased.
Superintendent Anthony Evans, divisional commander Pembrokeshire, said: “We’re appealing to rental property owners, to be aware of the potential risks associated with rentals leading up to and over the festive period.
“I urge property owners to be professionally curious when engaging with prospective customers to ensure compliance.
“These gatherings are putting lives at risk of those attending and the local communities. I would urge both residents and property owners to be vigilant, to help stop the spread of the virus.”