Since I’m trying to use org-agenda more, I spent a bit of time setting it up to show my CalDAV calendars (usually work meetings) using vdirsyncer, khal, khalel and nix/home-manager. I didn’t find any HOWTO on the web, so I had to read the documentation of the tools (yes, I know, the horror :D) to set it up, hence this write-up.
Let’s start with home-manager to install and configure vdirsyncer (which sync CalDAV calendars locally) and khal (which is an interface for the local calendars).