What do girls want in this situation?

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Asked a girl on social media if she wants to hang out. She said sure. I said she should come to an event. She asked for more details (date and time).
Sent it through and it's been 18 hours and no reply yet.
Activity status says been online hahaha

So wait longer or send something like "is that cool?" or "the event is on for the day so I could change it to another time if absolutely necessary" or something else?
What do girls want in this situation?
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