In addition, you would need to address all other modules and security/roles that is built-in to the existing modules...

If you get it to work, add a "Settings Parameter" to control it, and can maintain all existing functionality, I will be glad to roll it into the next release...please keep track of the modified code lines, so I can re-integrate it.  Thanks.

I finally figured out I had a bad reference to the DotNetNuke.dll and fixed it, now everything intellisences like its supposed to. I still can't figure out how to get the 03.02.00SqlDataProvider to add the UserID to the events table, or use my altered stored procedure which filters on the UserID. I changed the EventsGetByRange by adding a @UserID parameter, then in the WHERE I added UserID = @UserID, starting at the LoadEventDateRange and working back to the definition of the function I added the UserID as a parameter, also adding to every call and definition of EventsGetByRange. The altered files are DataProvider.vb, EventController.vb, EventMonth.ascx.vb, and SqlDataProvider.vb. I manually placed a field in the database called UserID and gave my one event an ID other than the one I use to log in, yet I still see it. I can only imagine my stored procedure isn't firing on install. Any suggestions?

Alan, just a little update on my progress and a question. So far I've been able to get the calendar to filter based on the logged in user. The problem is it only shows events that are assigned to the logged in user. I imagine what is needed is if there is no designated user for the event that everyone sees it, but if there is a designated user only they will see it. I only had to modify a few places to achieve this, the dataprovider.vb, eventcontroller.vb, the sqldataprovider.vb, and the 03.02.00.sqldataprovider files. Basically adding a userid parameter to each call of the EventsGetByRange function, while adding the userid and filter to the stored procedure of the EventsGetByRange function and adding a field to the events table called EventUserID (UserID was to unambiguous).

Now my question... Here's the important parts of the stored procedure
CREATE PROCEDURE {databaseOwner}{objectQualifier}EventsGetByRange
(
    @ModuleID int,
    @BeginDate datetime,
    @EndDate datetime,
    @UserID int
)
... followed by code

WHERE ((EventDateBegin  BETWEEN @BeginDate AND @EndDate)
    AND (SendReminder = 1)   
    AND (Approved = 1)
    AND (EventUserID = @UserID)) OR
    ((EventDateEnd  >= @BeginDate)
    AND (SendReminder = 1)   
    AND (Approved = 1)
    AND (EventUserID = @UserID))
  ORDER BY EventDateBegin, EventTimeBegin, EventDateEnd
END

As I'm sure you see there is the new parameter @UserID, which I've added a filter to the where clause of (EventUserID = @UserID). This is what limits the event to only be seen by the currently logged on user. How would you go about saying WHERE ... AND ((EventUserID = @UserID) OR (EventUserID = NULL)). I say NULL because if there is no EventUserID assign the value is NULL. I tried it just like I typed it here, but it didn't seem to work to well, perhaps I need something other than NULL?