If you want to close off registration for an event, prior to the event's actual date, then you'd just setup the event's tickets to only be available till a certain date. When there are no available tickets, the event will still be active and manageable, but people won't be able to register for it. This leaves things open so if you need to reschedule the event, ideally you wouldn't be doing it after the event's date has already passed, and can just make an edit to the event.
Additionally, setting up an event to have dates different than the actual event itself would just result in the contacts' calendar links and other elements being skewed.
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