Another notable feature merged in the GNOME Calendar live coding session today: the ability to export an entire calendar as an .ics file.
This was originally added to the wishlist 10 years ago: https://gitlab.gnome.org/GNOME/gnome-calendar/-/issues/31
Thanks to @FineFindus's dedication towards implementing this (alongside the individual event .ics export feature) this year, you will be able to use this feature in #GNOME 50 (or the nightly flatpak version of Calendar today): https://gitlab.gnome.org/GNOME/gnome-calendar/-/merge_requests/615