:wave: to enter "proper" shows, a bunny has to be registered with the British Rabbit Council (BRC) as a 'pedigree'. In England this is done by a light aluminium ring around one of the bun's rear legs - does your bunny have this? You should be able to see and feel it easily on her leg if she does.
Otherwise, many shows have pet classes, but to be perfectly honest I think most people here would agree that while it might be nice for you to show off your beloved bunny, your bun wouldn't appreciate it. Rabbits are animals which like to feel secure in their own normal permanent 'territory', they can get very stressed out whenever their environment is changed - different sounds, smells, travel, being handled by strangers, small cage for the day etc. Your bun won't understand what is going on and will most likely be very frightened - and apart from the fact that this in itself isn't a good thing, it can also lead to health problems because if a rabbit won't eat because it is stressed, it can quickly become life-threatening.
Of course lots of people take their rabbits to shows without these problems but to be honest, for a beloved pet, it's not a risk that I'd take and your bunny will be much happier if you bond with her at home.
Hope that helps