matsuoshi

export the posts schedules as iCal format.
iCal URL is: 
 http://YOUR-WP-ADDRESS/postical
<ul>
<li>GitHub: <a href="https://github.com/matsuoshi/wp-postical" rel="nofollow ugc">https://github.com/matsuoshi/wp-postical</a></li>
<li>WordPress plugin page: <a href="https://wordpress.org/plugins/postical/" rel="ugc">https://wordpress.org/plugins/postical/</a></li>
</ul>

postical (iCal exporter)

Postical; export the posts schedules as iCal format.

hoernerfranz

Ever thought about to use your (remote) CalDav Calendar(s) as an automatic data source for your favourite WP Calendar Plugin ? 
Searched for a Plugin that would provide this functionality in the WP Plugins Directory and found nothing useful ? 
Well, in case of ‘Yes’ to both questions, this is for You 🙂 . 
Just read the whole story at https://hoernerfranzracing.de/werner/kde-linux-web/wp-caldav2ics to check out if this will fit your needs… 
And yes, Calendar(s) is correct from Version 1.1.0 – you are no longer limited to just ONE Calendar Source !

WP-CalDav2ICS

Automatically create ICS File from CalDav Calendar

postical (iCal exporter) vs WP-CalDav2ICS