A couple of years ago we were booked for a festival at a country park - the marquees were sensibly spaced out to allow for them not to interfere with each other.

We got to our marquee where all the PA was set up ready, but not a chair in sight - I normally sit down to play the guitar but not only not a chair in the venue but not in any of the others - luckily one of the other acts had bought a folding stool with the which we borrowed; always carry a stool just in case these days. Live and learn.