Things I said but you probably didn't read or you did and just forgot:
* It's for charity.
ok, but you don't work this charity do you, and you haven't asked their permission to use their name in relation to this event yet - or if you have you haven't told them the nature of the event, or that it's going to be unlicensed have you, as there's no charity I've worked with that would touch this with a bargepole due to the serious potential for it to fuck up the charities reputation, which isn't worth the risk of a potential few grand income, or more likely a few hundred quid.
* I don't approve of violence. I don't want ANYONE to get hurt.
Good, neither do I
(other than a very limited range of circumstances where a small amount of targeted violence could end a much greater amount of violence)
Problem is that the way you're going about this seems to have the serious potential to provoke the police into using violence, which will inevitably lead to people getting hurt - and quite likely a few pissed people taking it upon themselves to defend the rig / themselves and potentially getting nicked for assaulting a police officer or something.
* It's my job to consider worst case scenarios.
and it's often my job to come in last minute and pick up the pieces when someone's gone off on one and bitten off more than they can chew.
I don't just do risk assessment, I also do risk mitigation, and trouble shooting for events... and when the shit does hit the fan, I'm usually the one sorting it out. The best way to avoid worst case scenarios though is to get someone seriously experienced to identify the risks in advance, identify the measures to take to avoid as many of the risks as possible, minimise the rest, and have the capacity to Identify and deal with any remaining problems before they become a major problem during the event.
The worst case scenario for a rave is either to have someone injure themselves because you've done the rave in a potential death trap, or to have the police think the place you're doing it is a potential death trap because it's marked as such, and come in and batter the fuck out of everyone (for their own good), then prosecute the organisers for anything they can think of. Hence the reason that every single person on this thread with experience of running raves has told you not to even consider using this MOD site.
so stop considering worst case scenarios, and take one of 2 potential courses of action... one get a professionally competent person / company to thoroughly check the site and sign off on it as being safe... or 2, abandon this site and find a different site.
anyway, I have some real paid work to be doing rounding up the rest of the trouble shooting team I run for a certain largescale electronic music festival that's taking place shortly, so here endeth the free advice.
If you want to hire me use the pm system on here to make me an offer.