def speaker_email(self):

        return self.speaker.email

    @property

    def number(self):

        return str(self.pk).zfill(3)

    @property

    def status(self):

        try:

            return self.result.status

        except ObjectDoesNotExist:

    def speakers(self):

        yield self.speaker

        speakers = self.additional_speakers.exclude(

            additionalspeaker__status=AdditionalSpeaker.SPEAKING_STATUS_DECLINED)

        for speaker in speakers:

            yield speaker

    def notification_email_context(self):

        return {

            "title": self.title,

            "speaker": self.speaker.name,