def __init__(self, event, attendees=None):
super().__init__(protocol=event.protocol,<EOL>main_resource=event.main_resource)<EOL>self._event = event<EOL>self.__attendees = []<EOL>self.untrack = True<EOL>if attendees:<EOL><INDENT>self.add(attendees)<EOL><DEDENT>self.untrack = False<EOL>
Create a collection of attendees

        :param Event event: event for which to assign the attendees
        :param attendees: list of attendees to add
        :type attendees: str or tuple(str, str) or Attendee or list[str] or
         list[tuple(str,str)] or list[Attendee]