Enterprise customers on Livestream have the ability to hide their events. However, there is currently no way to put your entire event page back into draft mode after publishing it.
If you would like to hide specific posts on that event page from the public, see here.
Otherwise, you can delete the event page, but this would delete all the event's content from Livestream. Deleting events cannot be undone, so it is not recommended unless you have backup recordings saved locally.