Hi
without knowledge of scripting this is what you could try:
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open the view "Calendar Entries and Notices" from within your Mail file - this will show a list of >all< calendar entries you have
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do a full text search for the title/description of the calendar entry you want to remove (Menu : View/Search)
Hint: put the string into quotes... e.g. : "description"
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If you managed to only display the 'wrong' entries in your search result, select all of them and delete them.