The exhibition judges can tell us for certain, but it was my (perhaps incorrect) understanding that it is up the club organizing the show, whether or not to have an off-scape bloom category. I've exhibited in perhaps a total of four shows, and iirc only the first show had an off-scape bloom category. (At least, that was the only time that I ever recall seeing that category, and I clerked for the last two shows I exhibited in; I was with the judges throughout the entirety of the judging, and there were no off-scape blooms judged.)
