These usually offer Starters, Novice, Intermediate and Senior classes.  They may also offer Jumpers.
You must be a member of the NZKC and your dog needs to be registered with them also.  If you do not have a pedigree dog, you can still register them on the obedience register.  These shows are advertised in the NZKC magazine, NZ Dog World and you need to pre enter.  These shows are often sponsored and winners and place getters receive prizes as well as ribbons, usually to 10% of entries.