I haven’t tested the spouse approval factor, but once Radicale is setup, you don’t have to do anything other than create new calendars through a caldav app, or through the web front end.

Android can use DavX to sync if you’re in to foss stuff

I pretty much only use it for tasks and a maintenance calendar, but I’ve had zero problems with it so far

All I need is for them to fix the public collection RSS feed bug where they embed “https,http” in the feed xml if you’re behind a reverse proxy - which breaks parsing

and has integration for Oxidized, smokeping, greylog and more