So I've been researching and apparently if you have waivers if it's still found to be YOUR equipment then you can still be hammer timed. So the only way to avoid that is with, public liability.
Now if we can find a company who is willing/"in the business" they would probably already have public liability and we can "partner" with them which will cover us for those things.
In terms of security, I'm not sure what we will do. Do we have security for the middle of the day or just have it from say 5:00pm -> 11:00pm or something. Assuming the venue closed at 11:00pm.
We also decided whoever we have doing security is wearing a "BAN HAMMER" shirt. And we may try to find a baton... in a shape of hammer... which may just be hammer actually..