How can I restrict Outlook Calendar event edits?

I’m currently working on a very user-friendly calendar setup in Airtable. Trouble is, my users still like having Outlook notifications to remind them when to head to one meeting or another. Airtable has an Outlook Calendar integration, which I’m testing this with, but I’m hitting some walls I wasn’t expecting. I want these calendar events to be exclusively notifications, so I need them to be as read-only as possible. (This is in Office 365, if that’s relevant.)

The generated events are getting added to an Outlook calendar I have access to, and as far as I can tell the edit permissions on that calendar should be set to “none.” No users are added to the calendar itself, because the events they’re notifying for are for departments all over the company (at least 600 people). The users involved are added as attendees to the Outlook events (via the Airtable integration), so they only get invites for events directly related to them.

When a user (not the admin) tries to move one of the events around, they get warned that the changes won’t be reflected for everyone else. However, they can click into the event and edit the date/time without any warning occurring. These changes aren’t reflected in the parent calendar’s event, but it’s still changed it for them personally. I can only see this going horribly wrong. Is there any way to make it impossible for non-calendar-owners to make edits to events they’re invited to?