I am not familiar with Drupal based sites, but is there a way to set up the calendar so it automatically sends an email announcement of events?

I manage a couple of Plone based sites, and there are Python scripts that send an email to members when an event is added or changed on the calendar. The members add the events themselves to the calendar (workflow rules require review before publishing the event) and then the email is sent when the event is published. An email is automatically sent to the designated reviewers when someone submits a new event for the calendar. No one has to look for events/announcements, it is more of a push system that informs the right folks when something has to be done. 

Perhaps someone who knows Drupal can find out if there are workflow rules that can be adapted to handle some of the load? I know very little about Drupal, so I am just thinking out loud.

Mark