BusyCal as a macOS client and baikal as a server.
Those two are reliable as can be. BusyCal is a great app with a responsive developer and can connect to virtually anything.
As to the topic of this post, despite the above, I’m trying to move away from CalDAV and CardDAV, the latter has poor support on most mobile platforms in the way I want to use it. I also am trying to reduce self hosted platforms I maintain, which is currently a high number.
Thank you for trying to make a difference.
Doesn’t always end up the way you want. We can’t let the occasional defeat stop us from trying.