UPDATE:
I have just had confirmation from Showground staff (received an email reply 28th June) that the Event is being held at the Showground.

This follows from the showground website specifically stating earlier this year that the event was not being held there, although this has now been updated to state it is being held there.
I also had heard from a family acquaintance who exhibits there that it was being moved to a new location for this year. He did tell us exactly where it was going to be, but I cannot remember where now.
Me thinks they were looking for a different location but couldn't find a suitable one.