Setting up Calendar App
"Calendar" app integration in Organizer, open the "Settings" page from the
Turn on the "Sync" option under the "Calendar App" section.
Also, specify the proper sync range ("Sync From" and "Sync To"). The longer you set this range, the more time it will take to sync events.
Also, go to "Mail, Contacts, Calendars" settings and make sure that "Sync" option is set to "All Events". Also, make sure that the proper "Time Zone Support" is provided. This should match the time zone in your iPhone.