Ahh, the old "it's only three days" chestnut.
I do hope you realise the big metal walls, stages, tents, toilets, lighting, sound equipment, refreshments, concessions etc don't just magically appear & disappear overnight? You know it all has to be transported in & erected, constructed? And that when stuff is constructed, like on a construction site, it's quite noisy & distracting? Banging, crashing, shouting, heavy plant moving around - beep beep beep reversing signals, engines revving - pneumatic tools? For 8 to 10 hours a day, every day? And that it tends to go on for two or three weeks before an event, and a week after when they take it all down again?
I'm sure my boys' GCSE prep won't be affected by any of that, especially if we close the windows (before someone suggests that as a resolution). I'm sure it won't affect anyone at the Harris schools either, actually taking their exams with that background noise.