Hold ticket inventory and publish to hidden link for external purchase

For some of our scheduled programs, it would be useful if we could set aside a certain number of tickets that would be removed from the program general inventory, but could then be sold via a private/hidden link to a specific group up to a certain date. Once the date expires, any unsold tickets from this group would be returned to the general inventory for anyone to purchase. This would help us to better manage ticket access for VIPs, members, donors, board members, special tours, etc.