My 3rd Mini-web design conference experience: Exposing them to the Deaf World

Since my topic is about proper use of ALT text, I can easily promote accessibility issues for the visually impaired. However, it’s the concerns of deaf people whom I’m having difficulty inserting into my talk. You see, the only significant accessibility issue applied for the deaf is the use (or non-use) of closed captions on videos posted on the Internet. So how can I make them feel the presence of the deaf in the audience? Solution? Sign language.