A lot of ranges require all guns, including CC guns be empty, cylinder open/slides locked to the rear.
Their range, their rules and I'll honor those rules if I'm shooting a match there.
However, I conduct most of the matches at our range. When not actually shooting all guns that are to be used will be unloaded and cylinders open, slides to the rear, and with rifles Empty Chamber indicator installed.
But that is for guns to be used. If you're not going to use your CC weapon, leave it in your pocket.
For example if I'm running CMP Vintage rifle matches, when not firing or told other wise all rifles are to be unloaded, bolt to the rear and empty chamber indicator. If you're carrying your CC, I don't care, nor is it my business, leave it in your pocket or holster.
Same with our pin shoots, if you're using, lets say, a 1911 for pins and you carry a J-frame concealed, and have no intention in using your Concealed Weapon, I don't have a problem with it.