1. Best is to restore from a recent backup.
Open the backup Outlook.pst file in menu File - Data files
Copy the missing info from the backup to your current Calendar.
2. If option 1 is not possible or not working, try this.
Close Outlook.
Search PC for file: scanpst.exe
When found, run it from the search result window.
Locate the Outlook.pst file.
Start the repair.
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