My understanding is that in order to show animals in state or official ‘breed’ shows, they need to be in tact. Some smaller shows (such as with 4H) may allow it. Although 4H also teaches you how to raise rabbits for food so maybe they judge on the criteria as to how many people it could feed… 
As such, you cannot allow show rabbits to inhabit the same cage or even cages that share a wire wall. Matings HAVE happened through the wire – albeit rare. In addition, as a show rabbit, you don’t want them to fight for any reason and matings as well can cause issues that will make a show rabbit no longer showable (such as having one bite piece of an ear off) – besides the fact that you can get 10 babies every month from matings.
In other words, no bonding for show animals, especially rabbits. They must be alone in seperate areas where they cannot reach one another – both to be safe from injury as well as from pregnacy. Sometimes you may see show dogs or cats playing together but that is due to the fact that they are not always in heat as well as you have usually a few seconds to get them apart if they do couple. With a rabbit, they’re always in heat and it can take less than 5 seconds for a mating to happen.