person A: I'm very socially awkward and tomorrow i'm going to have a playdate with some local moms and i'm so anxious
person B: I'm right there with you.. I still feel pretty introverted_comma_ but since coming to college_comma_ I've been forced to socialize more_comma_ and it's help me at least "fake it until I make it." I still prefer to be alone a lot of the time_comma_ but at least I can somewhat manage without making myself look dumb. Maybe you can just think of some topics/things to talk about to have in the back of your head for the times when things get quiet?
person A: that's a great idea! thank you for a great advice. 
person B: I hope it goes well! If it makes you feel any better_comma_ most of them are probably just as nervous and are looking for any excuse to relax and let their guard down_comma_ too. Good luck