I have never been to Glastonbury you are correct - the nearest I have been is Reading - where I took a walk for around 1 mile to find myself a lovely hedge for my number 2s. Again alone. Its also the time I have closest to doing a number 1 on someone - there is a few streams/brooks whatever you call them running thru the reading site - that obviuosly get used all day every day as a urinal - it was dark so I went to the usual spot, unzipped my fly and was just about to reach the point of no return - when a female voice from around 3 foot below me shouting expletives reached me.
I am not sure who was more shocked her or me!
As I say number 2s alone - number 1s is a shared experience.