You're unlikely to find many people on this forum who would be in favour of showing, I'm afraid! Do you have purebred bunnies with BRC rings? That's what you need in order to enter a 'proper' rabbit show. Other bunnies, even if they are purebred, can only be shown in the 'pet' classes.
Personally I would not advise it, as it is always going to be detrimental to the welfare of your bunnies and serves no useful purpose to them at all. At best, it means taking them in a carrier away from their familiar environment (and possibly their friends if they live together) and putting them alone into a wire cage with nowhere to hide in an unfamiliar setting with noises, smells, possibly lots of people staring into the cages, to be taken out and handled in an unfamiliar and potentially rough way by people they don't know. None of that is any good for their welfare and does absolutely nothing to benefit the rabbit and can only cause stress and unsettling.
The only 'benefit' in my opinion it is only good for the owner's ego if the bunny wins something...but there are far better ways to be proud of your lovely bunnies which don't involve compromising their happiness and welfare.