At the end of the day here in UK we are expected to excersise due care in respect to our patrons. The onlly way you can do this is to prepare documentation covering the risks the patrons (paying or not)may be exposed to and how you can mitigate those risks to try as far as you are able.

This usually involves a risk assement of all aspects of the event along with a manual of procedures (MOP).

A good MOP once produced will then need to be re visited each year to ensure that there are no changes for better or worse.

One event I am involved in the Mop is a4 about 1.5" thick and it covers everything. I didn't write it.

Andy