So The Big One says she's invited to a sleepover at Emily's* house and they're going swimming the next day and can she go?

I say sure.

We get to Emily's house and I ask Emily's dad "When do I pick her up?"

He says, "Six o'clock. Tomorrow."

"You mean 24 hours from now? For real?"

Turns out, the swimming was not at the local pool, like I assumed, but at someone's house that's about a 20 minute drive away.

Apparently, I have to learn to ask a few more questions in dealing with a high schooler.

*Collective noun for all The Big One's friends.