My dh, dd, and I went to a sci-fi convention at the beginning of August. We had a BLAST! There was one incident, however, that made me laugh, and it had nothing to do with the guest speakers or fun costumes…
I was walking into a panel room and looking for seats to save for dh and dd (they were on a potty break), and I walked around the front to the middle aisle to scope out seats. I saw a gentleman pulling forward and behind me on an electric scooter. I assumed he was moving or leaving, and kept walking. A woman on the front row said, rather rudely and loudly, "Um, Excuse me? Do you not SEE that man in his wheelchair?" I turned toward her and said, "Actually, no ma'am, I'm sorry, I didn't; I'm visually-impaired." (It's true; I'm legally blind and have only an 18° visual field; apparently, the gentleman was backing up and I didn't see him.) She got considerably quieter and said, "Oh, ok." in kind of a deflated voice." Her friend, trying to make light of an awkward situation, said, "Yeah, I feel like that some days…blind in one eye, can't see out of the other!" I smiled and answered, "That's pretty true for me; I'm legally blind in this eye (pointing to left eye), and this one (pointing to right) is made of glass!"
I could see just well enough to see the woman who yelled at me sink a little further into her chair…lol.
Interestingly, the man on the scooter said nothing at all. Another man complimented me on my glass eye, saying "I would've never guessed. That's an awesome prosthetic!"
Moral of the story: don't judge. Convention hall chairs don't hide embarrassed people well. ;)