The closest thing to what you are asking about is the Changed event of the SheetCollection. The collection can be found in the Sheets property of the workbook. It has event arguments, which specify the type of change action and the worksheet that they are performed on, however, when the action is remove, the worksheet is null. I suppose this can be easily solved by maintaining a list of names or even references to the existing worksheets and compare what is missing when the arguments indicate that a worksheet was removed.
I hope this helps.
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