You can add an event from the app to your personal calendar on your device by following the steps below.
Navigate to the Events folder in the app
Tap on the desired Event to open it
Tap 'Add' at the bottom of the Event in the app
This will launch your native calendar on your device tap 'Add' to your calendar (Below screenshots for iOS device - navigation may differ for Android devices)
You can also view the calendar by a Day or Month view by following the steps below:
Tap on the menu icon (top left 3 horizontal lines)
Tap on Calendar in the menu
You can tap on the Event in the month view
Or change the view to a Day view by clicking on 'Day' on the top right-hand side