This is next weekend, if you're passing by. Allegedly the biggest show in the Midlands, after Warley, and a lot more civilised.
If you do go, beware of the boggy car-parking. It was quite an issue a few years ago. I was up there a couple weeks ago and it was fairly soft then.
Also check for motorway roadworks. Not too much of an issue at weekends, but the odd slip-road closure has occurred, though mostly at night. And avoid driving through Stafford itself - it's a minefield. The A34 to the south of the town, in particular, is virtually impassable.