As well as viewing your calendar of To-Do items from within Nach, you can also subscribe to the calendar and access it from within other apps. Nach exports an
The exact method of subscribing varies depending on the app, but in general, you'll want to click the "Show subscription link" button on the Calendar tab in Nach, copy the link, and find an option like Add calendar by URL within your app. You don't want an "import" option, as that usually performs a one-off import, so won't stay synchronised with future changes.
The items on the calendar are only updated whenever your calendar app chooses to fetch updates from the Nach server. So, if you have the option of specifying how often the app should refresh the feed, it's helpful to make this as frequent as possible.