Setting up Shared Calendar to Notify of Appointments

So basically what I am trying to do is the following. I need to have a shared calendar setup to remind users of deadlines. For example, we issue licenses and licenses expire after 1 year or 6 months etc. I need multiple users to be able to enter data into a calendar (shared calendar) and I need one user to get notified of all appointments 15 minutes in advance of the appointment. I am basically using the calendar to remind one or two secretaries of deadlines. Any information on how I can accomplish this using exchange 2010 would be great. I know how to setup a shared mailbox for Room or Equipment, but no idea how to get the Calendar to notify a user of appointments as if it were her own calendar.