There are a number of different route options, depending on where you are coming from. Using images taken from dash-cam recordings on my own journeys, I've put together a number of sets of directions into Bristol and to the Arnos Manor hotel.
There are some gaps - for example, I've only covered one main route in from each direction, and no alternatives, and none of my regular journeys take me out towards Bath, so I've been unable to cover the route in from that direction - but those I have put together should cover the majority of people coming to the show.
These directions have been fairly quickly put together, with limited time available, so there is little or no styling - but they will be improved upon over time if the new venue proves successful and the organisers decide to use it again.