I personally would rather take a hammer to my crotch then go to an open tournament. Open VS Traditional, AAU tournaments in America with Karate are VERY Traditional... I have been to a few and they are judged well with a broad understanding of the multiforms that will be there. The Kumite is realistic, only the white padded hand mat's and a helmet if you're under 18 (or above if you want it)
You can attack the back, the kidney's, take downs, the entire gambit.
Open tournament = Yeah... lame. Gimme a break.
If you're using Glow Sticks and Techno music, you're not doing Kata, you're at a Rave in a gi.
While everything changes, nothing is truly lost.