Check out one of the AKC dog shows. If you go online to the AKC you can put in the state of Hawaii then see where the shows are
American Kennel Club - Event and Awards Search
If you then click on the show it will tell you who is the show secretary. About one week before the show you can go to the show secretary's sight and get actual ring times and what rings the rottweilers will be showing. Sounds a little complicated but not really.
Here is a link to an upcoming show in Hawaii, not sure if it is anywhere near you but is an example of how you can find events.
BaRay Event Services Inc. - Upcoming Shows
If you click on the link to the left of the "orchid..." and then scroll down to the bottom, click on the "judging program".
Only 2 rottweilers entered but maybe you can connect with them and get more info. They show at 10am on Sat and after 11am on Sunday. Sunday would be a great judge to go watch; she has been doing it for a long time.
Be sure to read all the stickies on how to find a COE breeder.
Oh one more thing (: when attempting to talk to someone that is showing it is usually best to wait until after they are completely finished in the ring.
-bliss