Mixing CalDAV, Google and Exchange Calendars

Using /e/OS Migrate to /e/OS
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I wrote on subscribing (read-only) to Google icalendars in german, I’ll restate the gist:

screenshot of where in the Google settings the ical calendar urls are shwon

google-calendar-share-links
google-calendar-share-links1037×770 37.7 KB

There are private and public web ical endpoints, difference being some hashes to protect them from guessing. Private:

https://calendar.google.com/calendar/ical/<long-hash>%40group.calendar.google.com/private-<small-hash>/basic.ics

public:

https://calendar.google.com/calendar/ical/info@example.com/public/basic.ics

Then you enter that address in “Settings → Accounts → + Web Calendar Manager”

As for Exchange, it can publish .ics endpoints - Introduction to publishing Internet Calendars - Microsoft Support