Reply to Bit of a Rave/Jam in a Field!

Myself and a few lads have got permission to use some land to host a Rave/Jam.

Have most of the odds and ends sorted out.

One problem though.

We have a marquee to have the main event/dance area in but the ground is a lil lumpy and could get muddy real fast with everyone dancing. Plus we dont want anyone to get hurt.

So I thought I will get some pallets from work to create a floor and that would be grand, but the wood is pretty weak and could snap.

Anyone have any Ideas to an alternative?

On the cheap ofcourse :P

Thanks