From the little bit I've read, it sounds like the term riot is a bit sensationalist. The people massed, but not everyone was going nuts/being rowdy. Just a few (well, more then a few) idiots.
As this was sort of being 'planned' for the last week, a 'leb' in Australia, dlishguy, has posted his views on it here (before it happened):
cornulla fight club in Tilted Australia
Anyone with half a brain knew not to go to the beach today.