There's accomodation at the pub and some B&B's in Horton which you can get by googling. The camp site in Horton is relatively small and fills up very quickly most weekends with 3P walkers, let alone the fell race weekend so I suspect its already full. I think the pub down the road towards Settle at Helwith Bridge lets people camp in their 'sheep field' but failing that the camp site at Stainforth (Knight Stainforth Hall) a couple of miles nearer Settle is a good one.