code: def to_event(self, event_type, field_name=None, depth=None):
          
          if self.ion_event is None:
              value = self
              if isinstance(self, IonPyNull):
                  value = None
              self.ion_event = IonEvent(event_type, ion_type=self.ion_type, value=value, field_name=field_name,
                                        annotations=self.ion_annotations, depth=depth)
          return self.ion_event
docs: Constructs an IonEvent from this _IonNature value.
  
          Args:
              event_type (IonEventType): The type of the resulting event.
              field_name (Optional[text]): The field name associated with this value, if any.
              depth (Optional[int]): The depth of this value.
  
          Returns:
              An IonEvent with the properties from this value.