The last one I went to was at Panthers Club in Penrith for my last employer, let's just say they look like Lifesavers.
Was a collection of about 15-20 different sites across Sydney, all under the one tent. A recipe for disaster if I ever saw one....and I did.
Working as a hydraulic relocation technician gave me interface with a boat load of Islanders......and don't they go to water when they get a skinful. One bloke was dancing on a table and tried to grab a slim looking stunner to share his gyrations with.......it was the Account Manager's partner. He took offence and tried to have a quiet word, and had his face punched in.
So old mate gets carried out by about 5-6 monster security guards (I think booze wasn't the only thing coursing through his veins) we resume festivities, when all of a sudden, he's somehow run up the side of this massive marquee/tent and caved in some air con piping. Gets escorted all the way to Mulgoa Rd, and we all have to head outside while they make sure the place is secure, coz he did a number on this air con gear.
Next thing you know, from across the car park (And for those that have been to Panthers, the car park is MASSIVE) we hear this trail bike with its neck being wrung. Old mate had bashed someone at the set of lights on his CR250, and he is SCREAMING towards this crowd. No helmet, shirt ripped off, eyes like dishpans. Everyone dives for cover, one of the seccos grabs a garden chair and hurls it at him. Cracks him right across the chest and face, he goes flying, the bike cannons into a tree, old mate looks DEAD. I mean deceased. Security do what they do, rush over to 'secure' him with their knees! I'm in hysterics watching this all unfold, I had only a few beers under my belt as I was escorting the casual worker who was hot. We ended up getting a cab back to my local and such.
The fall out on the Monday was huge. End of major Sydney Xmas parties, and I left for my current job the following year. I still bring that story up a lot. And that was one of many from that night. Last Chrissy party I attended though.