if you had the chickens you're bringing tested at the fair this summer, bring that paperwork ... if tested for pullorum, that's all they care about for the Ohio Nationals.
For the Ohio Nationals, say you have a golden sebright pullet ...
she can only show in the bantam clean legged rose comb golden sebright pullet class.
If you have a trio and enter as a trio, I think the judge them both as a trio and as individuals, but I'm not totally sure on that
If you email Eric for the catalog, the show entry form will be really easy to figure out how to fill out. It's hard to explain in a forum.
Good luck! Hope to see you there.