UI for handling / importing individual events from .ics files
Looks like https://bugzilla.gnome.org/show_bug.cgi?id=739295 was lost in the migration:
Right now, GNOME Calendar only handles EDS sources. It should support opening and managing ICS files as well.
At this point (gnome-calendar 3.22.2), when having gnome-calendar set as the default calendar application instead of Evolution, gnome-calendar will be started when clicking on a .ics file in e.g. Geary or Nautilus. I assume this is due to the presence of "MimeType=text/calendar;" in "org.gnome.Calendar.desktop". The application will be attempted to be launched...and fail gracefully without any form of notification or visual clue.