Deleting Individual events from a recurring series

In order to delete an individual event from a recurring series, you actually need to create a new event and set a few properties on it to link it up to a specific instance from the 'owning' series. You will need to set the following properties (You need all of them!):

• MasterSeriesItemID
  
  • Set this to the ID of the owning calendar list item
• UID
  
  • Set this to the UID of the ownding calendar list item. If you haven't populated this column in your owning list item, you'll be having all sorts of problems already...
• EventType
  
  • Set this to 3 to mark it as a deleted record
• fRecurrence
  
  • Set this to 1
• fAllDayEvent
  
  • Set this to the fAllDayEvent property of the owner calendar list item
• EventDate
  
  • Set this to the date of the event instance you want to delete
• EndDate
  
  • Set this to the date of the event instance you want to delete
• RecurrenceID
  
  • Set this to the date of the event instance you want to delete. (Yep, this is the one that caught me out...has to be set to a datetime and NOT an ID)
• Title
  
  • Set this to the title of the owner calendar event, but prefixed with Deleted:

When you have done this, you should now see an additional event in the All Events view of the calendar with a title of "Deleted: Name of your event" and the date of the specific instance. In the Calendar view, the specific instance should be invisible. This means that if you want to undo your deleted instance, you simply delete the extra list item that you have created and it will reappear!

The above extract is taken from Justin French's Blog. Justin's post talks more about working with SharePoint's Recurring Events. Do check it out.