I wish I’d managed to get there, looks like it was an interesting night. Regardless of your opinion on whether the festival should go ahead, I think it’s worth pointing out a few aspects of sound perception:
Sound pressure levels decay over an inverse square law with distance. So if you are very near to the source of a sound, and move a few metres away, the sound gets dramatically quieter. However, if you are a hundred metres away, and move another few metres back, the level barely changes. Another point to make is that decibel readings are fairly pointless as way of describing irritation from unwanted sound. For example, a continuous sine tone or burglar alarm can be very irritating even if it is at a low level, whilst a spread spectrum of pink noise at an equivalent total energy level might be barely noticeable. Music is in the ear of the beholder, so sits somewhere between the two. Finally, anyone who thinks that erecting a few soft temporary walls in the free field will make any difference frequencies below about 1kHz should really think again.
Tweets are below in chronological order. Don’t miss the bit about bongo drums.