Nah, just spend the week before the date going over all that stuff in your head over and over and over, making sure it basically the only thing on your mind. Practice ALL the conversations you're going to have. over and over again.
Then when things don't go exactly as rehearsed, panic and blurt out something stupid. If they laugh, they're a keeper. And if they don't leave it means they have flag color blindness.
Perfect system.

Its like its the middle of winter and the forecast says its going to be sunny an relatively warm on the weekend. Then you wake up Saturday and it's freezing rain and thunder.