Not that you asked but I find when people are passionate about what they are speaking about then it's all good. Have fun and enjoy yourself.
Can I get your autograph? Just relax and be yourself. They wouldn't have asked you to do it if they didn't have faith that you'd represent them properly. And good on you for stepping up to do it too, even though you aren't comfortable with it. Def
So instead of 15 minutes of fame, you get 3.