Seeing as the thread was revived and I just saw it, I'd still want to add that this is an important point.
Not everyone can just "go away":
people with mobility issues
people will care dependants
people with shift work or others that work over the weekend
people who don't have the money to throw at a holiday they don't want to take at that point of the year
Holding an incredibly loud event close to residential living creates another risk, one that perhaps the government, now that the NHS is trying to save money and benefits are cut, may want to listen to:
Sustained noise of that quality, with no means of escape, can cause hearing problems and contribute to hearing loss - it's a costly risk in health and work politics. There are further risks to noise, such as in the studies about road traffic, like higher blood pressure. This is not about "it's only three days" - three days thumping bass can give you permanent tinnitus if you're unlucky.
The noise can exacerbate other health issues, like psychological problems, too; it is related to a phenomenon called noise pollution.
There'll be plenty of news and studies about it
https://www.nidcd.nih.gov/health/noise-induced-hearing-loss
https://musiciansunion.org.uk/news/the-importance-of-hearing-damage-prevention-in-musicians-work
https://www.verywellmind.com/stress-and-noise-pollution-how-you-may-be-at-risk-3145041
btw, instead of earplugs, there is the option to buy (or to ask the agency who permits loud events to finance them) over-the-ear noise protectors, like workers at building sites and noisy workplaces wear. They have different protection levels, so read the label before buying. Of course they look a bit funny worn indoors, but they do offer better protection. They might be especially useful for kids who can't escape the noise and need their ears being protected even more.
As a bonus, the kids can also wear them when they visit a concert they like (at a suitable location, that is, not on another field next to residences); I've seen plenty of kids who visit concerts with their parents wearing them.