Wow! The level of control is crazy.
In our congregation we have a family with a son in a wheelchair. Only one of his family members were allowed to sit in the infirm area with him. So mum sat with him and his dad sat with the rest of the family elsewhere.
A friend of mine was constantly asked to move because she didn't look infirm so she took to walking around with a walking stick. She has a government issued disabled parking pass but was not allowed to park in the disabled parks without a Watchtower issued pass.
Just the entire process of attending convention creates such anxiety it's just not worth the effort.
They don't tell everyone you can stay home in your armchair and watch the entire thing on you tube.