Not "Large Festival" but went to "Rythym Festival a few times, and it was great, but that was only about 5000 people, so still managed to feel human, even when raining. Sadly it all went tits up (suspect it tried to expand too quickly).
Went to see Rod Stewart in New medow (Shrewsbry), and did not enjoy it. I'm sure Rod was fine, but it was all just too big.