Turn off networking on your Mac. Delete the event from iCal. Wait for the notification to show up in your Outbox. Delete email from Outbox. Turn back on networking. Once networking is back on, the sync will remove the other events from iCloud and your phone. Echoing Jaime Santa Cruz's comment below, you should definitely block the sender.

This is a good option for calendars that you only check occasionally. You can tell that your calendar is hidden if the square next to it isn't colored in. On your Android phone or tablet, open the Google Calendar app . In the top left, tap Menu . In your list of calendars, tap the colored box next to a calendar name.
I am now trying to delete the occurrence manually which I can usually do either by double clicking and choosing to open that occurrence's invite, or by right clicking and choosing Delete, then choosing the occurrence. This way it won't impact the overall recurring invite. However since the cancellation, right clicking the invite does nothing
Above ics file is working for delete old event form outlook and thunderbird calendar but not working for gmail. if any changes required in above calendar code to delete from gmail, then suggest me. – Satyendra
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I had the same problem, so I made a basic app for Android as I was learning react native. It uses the google calendar API to search for events you want to delete. You can see the list of events it will delete, and then you can press "delete" to delete them all at once. orth.uk/how-to-delete-many-events-in-one-go-in-google-calendar –

With Google Calendar, it's easy to set, reschedule, and even cancel meetings. Read on for a quick tutorial on how to cancel a meeting you've scheduled in Google Calendar.
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how to cancel an event on google calendar