Why is there so much crime at the Nottinghill carnival?

In London the Nottingham Hill Carnival is under way. It's a major event in the UK but what it's most noted for is the high crime rate and almost guaranteed murder.
To be clear in this question we're talking real crime not stuff like dropping litter or posting memes. The kinda crime we actually pay the police to deal with.
But it's a big event, so you might expect a few bad eggs. So I did a little research and compared it to two other big UK events Glastonbury and the Eisteddfod.

Nottinghill attracts 2000,000
Glastonbury 200,000
Eisteddfod 100,000 to 180,000
So let's adjust the figures to keep it fair.
Both Glastonbury and Nottinghill have over 20 arrests per 100,000 every year. The Eisteddfod has ZERO (in 2023 one man was arrested for possession of drugs)

Cost of policing Eisteddfod £10,000
Cost of policing Nottinghill £15 to 20 million

The screen shots are from Google AI and the standard newspaper which is a local London based paper.

So thoughts, why are the English based Nottinghill and Glastonbury so dangerous yet the Welsh Eisteddfod has virtually zero crime?
Why is there so much crime at the Nottinghill carnival?
Why is there so much crime at the Nottinghill carnival?
Why is there so much crime at the Nottinghill carnival?
Why is there so much crime at the Nottinghill carnival?
Why is there so much crime at the Nottinghill carnival?
Why is there so much crime at the Nottinghill carnival?
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