Calum has been to the 3 stags this weekend and asked about camping on this date and she said it depended on the weather. If it's been fairly dry chances are the field will be open for camping - they don't usually close it till the end of October.
So, we'll just have to see what the weather does. Mick and I will be there no matter what the weather as we sleep in the back of the 101 anyway!