is it: the competitor?
the person(s) running the meter?
the person(s) jigging the mic?
the other competitors in that class?
the person(s) that signs them up?
or someone im forgetting?

I know one of the answers your going to say is one of the judges, but what if there is no judge what do we do then?

The reason why i ask this is because ive heard from people in person and people in this fourum that this happens but never did see any response on who is responsible that a competitor gets in the right class.
thanks,
Luin Haden