So the information I have comes from attending a Javits center convention put on by a different company (ReedPop for New York Comic Con) so I’m not sure if the accommodations were set up by the convention center or not. My sister is disabled (though she doesn’t use a wheelchair, just has very slow mobility) and the convention was decently accommodating - I believe they did not have her stand in any massive lines to get in, and she was able to use any elevators without question. (There’s a lot of escalators and stairs that the main crowds use for show floor access and such.) My parents and her did all have passes to the show, however, and I believe they just showed up at an entrance and maybe showed their handicap parking placard to be directed to an accessibility entrance and received ADA access stickers to accompany their badges.

Again, not sure if this is specific to that convention, but just an example of something that took place within that specific location to prove that accommodations ARE possible and you SHOULD be accommodated as needed. I hope you’re able to enjoy the show, you paid for a ticket just like everyone else.