Wow, that was a lot to catch up on. I m the 4-h leader at my school. I have never seen a peacock shown at the parish or state level. Peafowl are in the other category. Since they do not need to be handled, to be shown, they should be caged. With all poultry, they need to be in good health and have the documentation to prove it. The animals are usually sold after the show as well.
BB, We all here are concerned for the welfare of your bird BB. After the horrible experience of losing a bird due to tethering, as an adult, one would know not to do it again. But you, an adolescent , with an adolescent brain, (undeveloped prefrontal cortex which is responsible for impulse control and lack of forethought to the consequences of actions and how it affects others or themselves, self centered, etc...) modifies the process with a different bird by tethering only 1 leg instead of 2. Your method is temporarily working for you now, and for you, that is fine. What you are failing to do is imagining your bird in a different environment with different noises and different people. You know you will do fine, but what about Thora? Think about her. You already said it yourself that Thora dislikes everyone/thing but you which gives good cause alone on why she should be caged and not tethered like a chicken. If she is shown in a turkey cage, then she will be less likely to injure herself or others at the fair. Just because you can tether her, it doesn't mean you should.
Peafowl are not common at a show and because of this and their striking looks, they win their category (other poultry). Do not risk being disqualified due to an unmanagble or injured bird. Start getting her used to the cage to prepare her for the show. Instead of sending pictures of her tethered, send us a picture of her in the turkey cage with the ribbon attatched to it. (And don't say I'm going to send a picture of her ribbon and tether) Now this is our come to Jesus talk. Nobody wants to hear anymore excuses. It is not about proving yourself, it is about your bird and her quality of life.

This is where you say yes ma'am (remember I'm in the South) and nothing else.
Zaz, you do grow pretty things!