I imported an iCalendar (.ics) file into macOS Calendar. Because I expected the file to only contain a handful of events, I chose to add the events to an existing calendar rather than create a new one. However, the file turned out to contain hundreds or thousands of events, most of which were not relevant to me and which I don't want spamming my calendar.
I tried to undo the import immediately after it happened, but undo was not available. I tried manually deleting some of the events, which works for some of them, but many others have other invitees and Calendar says it will notify them when I delete the event which I want to avoid as it would mean sending many notifications. I don't want to delete the calendar to which I added the events, as it already contained a lot of events that I don't want to lose and that would be a lot of work to note down and recreate.
Is there any way I can bulk remove these events without sending a bunch of notifications? I'm willing to use third-party software if necessary.
Edited to add: Most/all of the invitees on these events are firstname.lastname@example.org addresses, so I assume the emails would be sent to some sort of group of subscribers or members on the Google Calendar from which the events were exported.
If I try to move one of the offending events to another calendar, I get a message:
You're about to send an invitation for "event_name".
Do you want to send "event_name" now, continue editing the event or revert the changes?
The options are Revert, Edit, or Send.