Thank you for your replies, folks! It's nice to know that someone cares and understands.

Soidhonia,
I've never thought of the fact that staying in a spot for too long can be a trigger for social anxiety. That's interesting! I can see how that is true!
Okay, maybe I can practice my Open House speech in front of my husband and daughter and see if this helps.
I'll be taking Ativan which does help calm me down (but, somehow, doesn't stop me from worrying about things like this weeks before it happens). The worst part is when I feel like I can't breathe and when my mind goes "totally blank" when asked the simplest of questions. Ugggghhhh! It can be soooo frustrating!

Pacyderm,
I agree about the listening part! Unfortunately, instead of being able to fully listen to the parents my brain is wondering what question will come up next, will I be able to answer it, exactly how stupid do I look, do they notice that I can't catch my breath or that I can't speak smoothly, do they notice that I am bright red?? I know I need to change these thoughts but have yet succeeded in doing so. It is so hard to try to remain calm while you are with a group of people and trying to answer questions.

Debbie Tabor,
I take Ativan and beta blockers before doing things like this. I think they actually help me at the time, but the anticipatory anxiety feels excruciating at times.

Thanks!