Excel VBA Macro to find and delete appointment in Outlook Public Calendar

Hi guys I have been using Excel VBA for a couple of months now so still fairly new and learning as I go along so any help would be massively appreciated. I have a macro below which allows users to create a new appointment in a Public Calendar on Outlook and invite attendees by clicking a checkbox in Excel. What I now want to be able to do is by unchecking the checkbox the appointment will be deleted from the Public calendar and a cancellation sent to the attendees. Is this possible? The macro I currently use to create the appointments is:

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