If they call on you and you don't want to talk just say thanks for calling on me I would like to listen today. That simple! They get it! I do hope you enjoy and hear something that resonates with you as I'm sure you will. I am still nervous to go but when I do I am always so glad and something great usually happens that I would have missed out on if I had not gone. Just from experience I have not ran into someone I know but that can be be different every where. If you see someone you know it's supposed to be confidential. if you end up seeing someone you know, well maybe that's a sign and you can reach out to them!