I have a workbook where the users will be expected to input all data via a
userform (to ensure standardization of information), and the data that is
submitted will be added to a worksheet that has cells locked/protected.

Currently, a user can select a cell, but if they try to edit it, they get
the standard Excel "this cell is protected, if you want to change it
unprotect the sheet, and you may be asked for a password" message.

Is there a way for me to intercept whatever event is firing, and pop up my
own custom message box so I can tell the user /why/ the sheet is locked?
something more like "This sheet is protected to ensure data integrity.
Please enter all data through the userform. If you need to edit or delete
data please contact (name)"

Any help would be greatly appreciated.
Thanks,
Keith

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The enclosed questions or comments are entirely mine and don't represent the
thoughts, views, or policy of my employer. Any errors or omissions are my
own.