Here in the States, one thing that is changing fast in the "outside" market is insurance. There are lots of catering halls, and private clubs that REQUIRE sub contracters to carry liability insurance. I have a 2million in coverage, and it only costs about $175 per year.
Now, if someone trips over a speaker wire, or gets skewered with a mic boom - the club is not responsible.....I am.
Is it like that accross the globe?