Prevent events you are invited to from being added to your calendar.

When an event is added to a shared department calendar and the user is added as an attendee, that event is then added to the users personal calendar, resulting in two instances of the same event. We would really love to use the attendee feature, and do not wish to have our users constantly having to toggle calendars on and off just to reduce clutter. We would also like to use the shared calendars, rather than only personal calendars as the color coding will make it easier for those who are members of multiple groups to quickly see what each event is relating to. Is there any way to prevent these events from automatically being added to the users personal calendars?