I emailed the guy to find out some more information (and how to get there) and he said there should be a very obvious banner that says "Hamsters" so you know where they are. He also said...
Judging for the pet show is at 2. Come earlier so you have time to
book in and settle your little Darling, and have a look round. We
will have the main hamster show going on all day, a pet shop for
hamster things, usually second hand cages, hopefully baby hamsters for
sale, a tombola, coffee shop serving breakfast, lunch and tea. You
can chat about hamsters to all of us.
Bring your darling in their own cage or a carry box. Suggest they are
cleaned out, must have food and water/ or a vegetable chunk ie.
cucumber for moisture, bedding, and substrate. We will not take out a
sick hamster and can't give advice if they are ill. Pets are judged on
tameness and condition. Entry to the Pet Show is £1 per animals,
humans are free!
We will be starting the main hamster show around 11. You are
welcome any time after that.
I've decided I'm definitely going to go whether I decide to enter my hams or not