def METHOD_NAME(self):
    self.stdout.write("adding YSO audience keywords to events...")
    for event in Event.objects.exclude(audience__isnull=True).prefetch_related(
        "audience"
    ):
        for audience in event.audience.all():
            # if current audience is a valid hel.fi audience keyword, iterate YSO keywords corresponding to it
            for yso_keyword_id in KEYWORD_MAPPING.get(audience.id, []):
                yso_keyword_obj = self.get_keyword_obj(yso_keyword_id)
                if yso_keyword_obj not in event.audience.all():
                    event.audience.add(yso_keyword_obj)
                    self.stdout.write(
                        "added %s (%s) to %s"
                        % (yso_keyword_obj, yso_keyword_id, event)
                    )