Alerts on delegate accounts in Calendar

Background: We use Microsoft Outlook for work (email, calendar, etc.). However, I cannot stand Outlook calendar, so I have it synced with Apple Calendar since I have a MacBook Air. In addition to having my own calendar synced, I have have many of my colleagues calendars loaded so that I can see them for scheduling purposes, etc. However, I do not have read/write access to their calendars. Just read-only.

Problem: Recently, the Calendar App started giving me in-app alerts / badges when my colleagues' calendars have new events added or invitations or really any sort of activity. And it also gives me the options to "Accept, Decline, or Maybe" for invitations. I do not want to see these updates or have the option of making calendar decisions for calendars that are not my own, but I do want to be able to see my colleagues calendars. Is there any way to resolve this?

I have checked every setting I can, but there does not appear to be any way to make this stop. To be clear, I am not talking about the notification center alerts, I mean in-app alerts / badges. Despite the fact that Calendar recognizes I only have read access to these calendars it is treating me as if I am an official delegate of those calendars. (And if you do attempt to click "accept" on one of those invites, it gives you an error as such that it cannot save that action because you do not have permission, so why is it showing me their activity at all?) This issue did not used to happen either, so something changed with Calendar. It seems like a big flaw with Calendar and makes being able to sync non-iCal calendars to it impossible (I do not want to be flooded with my coworkers calendar activities).

Any thoughts / help would be appreciated!