I'm partially with Digger. I used to be a bit of a wild man.... although I never used more than my mouth at a police officer. And that got me in enough trouble anyway.

As far as 500 at my next meet, we used to reguarly host 500 people at our Elsternwick Mansion parties [login required: guest/guest]. 2+ sound systems, international talent. Back then, we learned a great tip to actually "register" your party with VIC police. You'd go fill out some paperwork at the station, and they'd give you a "Party Safe" packet which included this great poster that said "This party is registered with the Victoria Police" which we'd hang on the front door. It was awesome because it scared away the dregs. And when the police came, which they inevitably and repeatedly did, they would ask us if everything was OK!!! A little bit of respect goes a long way.