iCal:
To get your iCal Apple calendar events into your digital planner, do a split screen with Goodnotes and iCal then drag and drop the event from iCal into the digital planner. It will import the event, time, date and location as text into the planner.
Google Calendar:
To get your Google calendar events into your digital planner, do a split screen with Goodnotes and Google Calendar (optional), open an event then tap and hold, tap copy then paste the event from Google Calendar into the digital planner. It will import the event, time, and date as text into the planner.