Google calendars are no longer shown since October 2018
All my Google Calendars show up fine in Evolution, but no longer in GNOME Calendar. Note that I had set up those calendars as type "Google" in Evolution, i.e. they were set directly in Evolution, not using GNOME Online Accounts.
I thought maybe that's because I'm running the flatpak version on top of Fedora 27 which has an older version of Evolution/EDS (3.26.6) and that somehow the API was broken, but I'm not sure, and there are other people experiencing remote calendaring issues in #347 but I'm not sure it's the same issue.
The last "known good" version I have on one of my computers is this:
flatpak info org.gnome.Calendar/x86_64/master Ref: app/org.gnome.Calendar/x86_64/master ID: org.gnome.Calendar Arch: x86_64 Branch: master Origin: org.gnome.Calendar-origin Collection ID: Date: 2018-10-02 13:07:47 +0000 Subject: Build of org.gnome.Calendar, Tue Oct 2 13:03:23 UTC 2018 Commit: ea530e3b1ac4ed8370f3d8b6b4106bb017e4f8b32569070b5033c8d39108071c Parent: c8d7c4501133b07dd2e95a00bdb6b7fdd2bd8f26218e98567ed478e2c52b2906 Location: /var/lib/flatpak/app/org.gnome.Calendar/x86_64/master/ea530e3b1ac4ed8370f3d8b6b4106bb017e4f8b32569070b5033c8d39108071c Installed size: 14,8 MB Runtime: org.gnome.Platform/x86_64/master Sdk: org.gnome.Sdk/x86_64/master