In happy tinkering news, I spent a few more minutes with my vdirsyncer, mutt, khal, and khard setup (from https://neilzone.co.uk/2024/12/using-khal-and-khard-to-access-appointments-and-contacts-synced-from-a-nextcloud-caldavcardav-server-using-vdirsyncer/).
I have added tab auto-complete of addresses from khard from within mutt's compose screen, and I can now create appointments from within khard (even if I don't understand how adding attendees works (if at all) yet).
I'm struggling to import .ics from mutt into khal, but one step at a time.
