Do in advance everything you can think of to make things go smoothly on show day. During the event the workers and judges are constantly striving to run the event efficiently, but not at the cost of an upbeat attitude. This is a tricky balancing act. Don't expect perfection on the first try, but DO keep trying. When things don't go according to your careful plans - be flexible and improvise, keeping your goals in mind.
Improvement is a continual thing - there's always room for more.
Good prizes for the dogs. A good raffle. Special fun awards voted on by the spectators and participants. Dog having the most fun, etc. A social event with good food.