This is just a tip which I thought I would pass on.
When we go to shows and have a stand, what we need to do is check the public liability insurance. Our staff on the stand are covered by workers comp, but if anyone from the public goes into our stand, falls and hurts themselves, then its the stand holder (us) who is accountable. I suspect that this applies in many situations, for example, say you get a stand in a fete, you have a stand in a street fair or a show you probably are responsible too.
My advice would be to check with the organisers and your insurance broker and get this matter cleared up first.
