You might notice some calendar events appearing in your beorg agenda from a “Found In Natural Language” calendar. This is a calendar created by iOS based on text it thinks indicates an event - for example from text messages.
As this is a special calendar created and managed by iOS it doesn’t appear in the list of calendars in beorg.
If you find you don’t want these events to appear in beorg (and in other apps which use the calendar) then you can turn them off. To do so: