Include a checkbox and text field in registration for "I am a person with a disability/traveling with a person with a disability and may require additional accomodation" and have a dedicated Concom liason for following up with everyone who checks this and makes sure that the needs are met. [ETA: Response from mobility aide.]

THIS. As a person with a disability, this would make me feel much better - that VVC is aware & cares about disability issues.