can you use msdb.dbo.sp_send_dbmail to set up calendar appointments?
(I dont have outlook to test it .. so the code is not tested by me)

Borrowed from : Send Outlook Calendar Requests in Email 

EXEC msdb.dbo.sp_send_dbmail    
  @recipients ='&lt;your email address&gt;'    
  ,@subject = 'iCalendar Example'    
  , @query = 'SET NOCOUNT ON;SELECT ''BEGIN:VCALENDAR''+ CHAR(13)+ ''VERSION:2.0''+ CHAR(13)+ ''METHOD:PUBLISH''+ CHAR(13)+ ''BEGIN:VEVENT''+ CHAR(13)+ ''CLASS:PUBLIC''+ CHAR(13)+ ''DESCRIPTION:This is the iCalendar example Most client application support it''+ CHAR(13)+ ''SUMMARY:iCalendar''+ CHAR(13)+ ''DTEND:20150325T110000''+ CHAR(13)+ ''DTSTART:20150325T120000''+ CHAR(13)+ ''LOCATION:My Office''+ CHAR(13)+ ''END:VEVENT''+ CHAR(13)+ ''END:VCALENDAR'''   
  , @attach_query_result_as_file = 1   
  , @query_result_header = 0   
  , @query_result_separator = 'CHAR(10)+CHAR(13)'   
  , @exclude_query_output = 1   
  , @query_attachment_filename = '123.ics'