When an event is stored in your Calendaring folder, you may want to re-send a confirmation to the event organizer. Open the Calendaring folder and open the Event. The same Event Reply buttons are displayed. Click the Accept or Tentative button to send a positive response to the event organizer.
You may want not to attend an event that you have already acknowledged. Open the Event in your Calendaring folder, and click the Decline button. A negative response is sent to the Event organizer and the Event is removed from your Calendaring folder.