You can add admins to a Session, and they will be notified of all the registrations for those sessions.
Important Note:
Admins will not be notified of payments made by customers or additional adjustments made to the registration, only the initial transaction.
Instructions
Navigate to Activities, then to Activity List
Expand an Activity
Select Edit Session (pencil icon) next to the session you want to add an Admin to
Navigate to the Access tab
Click Add Item under Admin
Search for and select your desired user
Choose to Notify or Don't Notify
Repeat steps 5-7 for any additional Admins
Click Save Session