The gathering (www.thegathering.co.nz) is also the southern hemispheres biggest rave, held (so far) annually over New Years eve in the hills above Takaka, New Zealand. 7+ zones of drum and bass, techno etc, all outside in the native bush.
This past one would have been wonderful had it not been for the tropical storm slamming the area for 2 days. Anybody care for 10000 people on X, in a freezing downpour, surronded by incredibly loud music. Now that's surreal.