We've just added an iCal link to the Calendar view. This will allow you to add it to your calendar app or something like Home Assistant or anything else that can utilize a calendar.
Please note though, that this will only work locally as it is behind the same authentication as everything else in your Channels DVR Server web admin. So you’ll need to use the local url to fetch it, not the remote DVR url.
So you can subscribe to your calendar app on a home computer, or your home automation, or any other tooling you want to use, but this won't work from things like Google Calendar, Yahoo, or Outlook.com.