Well Phil I have a few places I could do this. There is the river where we had a it a few years ago, the bonus there is Dave's (from Leisure Line) father has a place almost right next door and the two people in between are very accommodating. There is acres there but if there is more than 30 people I'll need a tent.
Another option is my house, 1200 sq foot garage and another 1200 in the basement, all concrete.
Basement is semi finished. The yard is enormous and this place is just begging for a massive party.
....we'll get to that when we get to it.