If we are camping anyway then the cost of having us in one area should be the same as having us spread out. Would just make it easier for 'them' to keep an eye us in any case.
The cost of a marquee, or big tent should hardly break the bank when spread around. I found one hire company that also rents hot-tubs! They also do silent discos - they rent you over 100 wireless headphones - that would be bizarre.
Plus as it will be our own beer rather than a pubs beer the cost of the marquee will be paid for in reduced beer prices.
Meface