You'll do great Mad. What class are you going?June 21st? That's a Monday right? I live in San Diego, I'll have to try an make it up there.
I did a show 4 years ago, and I agree with bigshug, my biggest fear was hitting a pose and hearing crickets!! Invite everyone you know, this is going to be your day to shine. You put so much time and effort into getting ready, you'll want everyone to know it!
Good luck, keep us posted!