Set specific date for when guests can be registered for events

For events, have an option to set a specific date that guests can be registered so that members have first priority.  Similar to the event registration where you can set different dates/times that membership categories can register. 

For example, space is limited to only 50 registrants.  Allow members to register up to a certain date, and then at that point they can register their guests if space is still available.  

You can manually do this, but would be great to not have to manually do it each week for reoccurring events.