I am a county 4H leader & Poultry Developmental Commitee member in Michigan, and I know our Poultry Developmental Commitee has been sought after before to help other county's 4H poultry programs. We host a state wide 4H poultry show and when doing so we try to find judges that judge birds on the American Poultry Assn. standards. We do that for our county fair also. They judge by the breed description in the Standard of Perfection, just as is done in an open show. That way our kids will learn the pro's and con's of different breeds, and if they have birds that meet the standard or not.
Some kids don't mind having the backyard chicken, they love them no matter what. Others strive to bring the best they have, and breed even better. I know our county doesn't have a spot for the backyard bird in our listing, but some kids choose the breed their bird most resembles and put them in that class. That's not to say the bird won't be disqualified, but it helps the kids have a better idea of what they have.
Also, we have many kids who's showmanship (yes, it's required in our county to show poultry) bird is a mutt, raised in the kitchen and constant companion to those great kids! Sometimes this is the BEST bird for that particular class. The mutt birds are like dogs and many seem to get the best of all breeds involved, and are usually well loved by their people
Best of luck to you, and i'd agree with the others, check with your local 4H extension office and find a club to visit!