Yes, festivals aren't for everyone. You need a certain tolerance for being dirty (not showering for a few days), and be able to handle pretty disgusting toilets.
And if you're autistic you need to be aware that the noise never stops, there might not be the option to get away from people, it's a full-on sensory assault for days.
That said, I used to love Glastonbury. I've been 10 times. The weather can be unpredictable, when it gets muddy its not far short of an ordeal. But i don't seem to mind the crowds there for some reason, or the noise. I love live music.
Weirdly, there was an article in the Guardian today written by an autistic person about going to Glastonbury.
I don't go anymore because its way too expensive and music seems to have moved on and left me behind a bit. There's nothing on the line up that I want to see. If guitar music becomes mainstream again I may return one day. I'd like to.
I still go to a smaller 3-day music festival near me most years and I go on my own.
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It's dark. Is it always this dark?