Long story made short: I was at a recent science-fiction convention, and someone thoughtfully found a guide for me. A woman came into a discussion group and sat down next to me, and I heard her check her talking clock. We introduced ourselves and then she said, "I'm visually impaired, but I can see to give you a guide!" Well, there wasn't much guiding going on; mainly talking and meeting mutual friends for the rest of the convention! very fun. :)