I have now filed a meta issue for keyboard navigation, for all who may be interested in finding issues and contributing fixes in the #GNOME #Calendar code to improve #accessibility / #a11y : https://gitlab.gnome.org/GNOME/gnome-calendar/-/issues/1036
Improve keyboard navigation and annotations throughout the app for better accessibility (a11y) (#1036) · Issues · GNOME / gnome-calendar · GitLab
GNOME Calendar is not known to be very accessible nor keyboard-friendly. This is a list of currently known issues we have been able to find so far. Help...GitLab