Why would YOU need to entertain HER? Because she doesnt have that much of a personality? Why are you even dating this girl if she's boring?
As for the night, just do what you said you would do. Have a couple of drinks, and "watch" a movie. We all know what that mean. She does too!
If you are nervous you will run out of things to say while you guys a drinking. Just cook something to eat. Even if she's not eating, tell her you got to eat... She will probably help you cooking and you can have fun with her while cooking and drinking.
This is basically a "small ice-breaker"... Once you are done cooking, you will probably have a couple of drinks in so things will get smoother. From that moment, game on.
