Thank you for your reply!
Unfortunately I really can’t provide the ICS, since this is my work calendar. It contains confidential information, and it is also huge so it’s hard to anonymize it.
But I have taken the screenshots:
Events as displayed in Google Calendar (web):
Events as displayed in the Google Calendar app (phone)
I suspect you are right about the ORGANIZER (or ATTENDEE, in case the organizer is not me). My work email address, which is associated with the calendar, is not present as an account on my phone. And although I did use my email address as the calendar’s name in ICSx5, it appears that that is not recognized as an account within android, and so the google calendar app wouldn’t know about it.
I hoped that maybe there’s a trick or setting to tell the calendar app which email address is me, so that it could color the events accordingly when the email address is in the ORGANIZER or ATTENDEE information. But I do not want to add my work google account to my personal phone as an android google account, so I’d need some sort of workaround there.
Perhaps you have an idea?