Hiya
I was intrigued by the idea that big festivals (like Cheltenham) might have an effect on the results, so I did a little digging in the software
Here's what I did for Cheltenham;
I've filtered the 5 presets that Martin sends out by:
The 3 days of the festival itself
Festival Week
The week before the festival (when things are getting prepped) and,
The week after the festival (when ppl might be really hungover or something)
The only pattern I can see in all this is that Back the C&D does quite well in the week of the festival, and not so well the week after (i.e. the week we're in now). But that's only based on 2 years of data.
You might be able to see some other pattern though 
Important to say; some of my data might be wrong (it was really boring to do this and I started to fall asleep),
and I was using my own presets versions, which have been very slightly tweaked from the originals
Anyway, this is what I got.

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