I'm forwarding your post to a couple of friends of mine who live in DC. I don't know if they'll do anything - but they all disagree with creationism in all its nefarious forms.
Could you forward some more details on both the expo and the conferences? F'rinstance, what ISNA is? Maybe where it's located? I couldn't find anything on Yahya's website, and one of my friends asked for more details. Thanks...