By first encounter, I mean meeting the person in an event, such a meetup in a cafe, or a seminar, or such. The event is to be expected, but is not planned by us; we are invited to join the event, if we can. There are several that we have been acquainted before (briefly, in the previous event), but there will be many that we haven't.
The event is a Deaf meetup (to encourage hearie to learn Deaf culture), but it's to be expected that many people with various disability to attend. I'm mainly concerned about navigating topics to avoid and behavior that may offend them, while at the same time I don't want to lose opportunity to make new friends.
How to handle the encounter with the disabled in this situation?
From the previous event, I'm expecting Deaf (obviously), those on wheelchair and crutches. I'm not expecting blind people (but there might be in the next event).
One of the question I have is whether asking about when, how, or why they've gone disabled is an appropriate question, but this is not the main question. This event will be held in Indonesia, but I believe "disability culture" is more important, thus I welcome answers from anywhere.