Linda - All you need's a sleeping bag, an airbed and a pillow. The indoor camping's in a large school gym, with showers and toilets, and it's free to anyone with a weekend ticket. All meals and drinks are available in the dining room. Fionn - Local floor space is hard to find, hardly anyone from the town goes to the festival, most of the crowd's from the rest of the UK.
I'll be in a small tent out on the football field (the other possibility).
It's definitely worth staying the weekend - the craic's tremendous.
Cheers
Ray