NES, its a party organized by a family from Liberia in one of their huge farms, a lot of people from the Central Valley go. Kinda like Palmares just for one night.
It depends on what you're looking for. I've been to 10 or 12 of their parties. Its no way near what they used to be. Now its mostly 14-16 yr olds, and its extremely comercial. When they first started doing them it was just word of mouth advertising so it was all people you knew or had seen somewhere, and it was like c4000 cover and it included like 8 drinks. Now its insanely expensive and you get like 2 drinks, lines to get in and to get drinks are a nightmare, they came up with vip section which is just a toldo like the one's in Palmares and for some reason everyone wants to get in (including myself a couple of years) and it pretty much sucks. It used to be just a couple of beer stands and everyone hanging out in a farm, they had young bull fights and a lot of people would get in with the bulls, they were small and no horns so no one got injured, funny shit, everyone drunk. Another shitty thing is that if it rains the party is fucked, you can expect mud up to your knees.
Only good thing about this year is that Infected Mushroom is playing, for all you druggies.
That pre-venta shit I think its just bullshit. They'll probably sell tickets at the gate since all they are worried about is making $$ and the farm is huge, so no crowd can be too much. But making the drive out there and not being able to go would suck, but you can always go to "las fiestas" in town.
If you haven't been to one of those definitely check it out if you can. They're a lot of fun, just no what they used to be.