Information emailed to people who have booked stands in the trade hall states:
"On Friday, the Trade Hall will be available for set-up between 19:00 and 23:00. The Trade Hall will not be open to the public, and will be locked overnight. Delegate registration will be from 20:00 to 22:30 and the Bar will be open from 20:00 to midnight. On Saturday, the Trade Hall will be open for setting up at 08:30, and the doors will be open to the public at 09:00."
I would guess that anyone who arrives before 20:00 on Friday will be given a job to do.
I'm told that camping is in the field in the primary school opposite, but parking is at the main venue (there is only space at the primary school for campervans to park). You should be prepared to carry all your camping stuff the short distance between the two sites. The camping area will have a no fires and no music policy.