docs: def remove_attendees(self, attendees):
      """
      Removes attendees from the event.
  
      *attendees* can be a list of email addresses or :class:`ExchangeEventAttendee` objects.
      """
  
      attendees_to_delete = self._build_resource_dictionary(attendees)
      for email in attendees_to_delete.keys():
        if email in self._attendees:
          del self._attendees[email]
  
      self._dirty_attributes.add(u'attendees')