Sometimes a date will end right after dinner. Other times you can go to another place such as a bar, or go bowling, or see a movie. It is your responsibility to find out what the other person likes to do and then suggest it. If the date was strictly for dinner, then it will be difficult, but in this case, Mike suggested a dinner and a movie, or another thing. That means Janet should have left the night open.
In this scenario, Mike is using both her interests here. In the States, they serve alcohol so drinking and bowling together is a great option.
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