Awww cute, she already has a friend
How old is she? Spaying is recommended for two main reasons. First, when they reach maturity they can often become territorial and unspayed females will often suddenly fight with a hutchmate because they view them as a 'threat' to their territory. I would think this risk would increase hugely if you were to take one or both of them to shows: if they are taken together they could well fight when they smell all the other rabbits, and if they are taken separately they are likely to fight when you put them back together again afterwards (not recommended anyway as rabbits won't understand why you've taken them away from their friend).
Second, studies show that uterine cancer is incredibly common in female rabbits - some studies show up to 85% and whether you believe the statistic or not, many vets who spay for rescues say that they see an awful lot of cancer or pre-cancerous changes in bunnies they spay. It's remarkably common and the risk can be eliminated by spaying, and of course the younger they are spayed, the safer the operation is.
Can we see some photos of them both??