Cars, dogs, other cats, disease, poisons, and wild animals are very commonly the downfall of an outdoor cat. Weather has a big effect on cats. Be sure they have a warm dry place to sleep in the winter, and have a cool place in the heat of summer. Be careful that outdoor cats don't climb in the engine compart of your car, its warm and cats tend to sleep there when its cold outside. Give a honk of the horn and pause to make sure all's clear.
Many dangers can shorten a cats life if they are let outdoors to roam free and unsupervised.
If you love your cat keep them inside and safe from all the dangers of an outdoor world. They won't miss it, if they have never been outside to begin with. These are domestic animals, not wild felines that crave open spaces. They look forward to seeing all the people, the judges, and the other cats. On the other hand, there are some cats who are just content to be with their family at home and really don't want to go to shows.