Find any upcoming or current live chat to advertise on the home page or
        live chat page.
        These are LiveChat's with primary category of 'ask-mama' and category
        of 'live-chat'. The Chat date must be less than 5 days away, or
        happening now.

def upcoming_live_chat(self):
        """
        Find any upcoming or current live chat to advertise on the home page or
        live chat page.
        These are LiveChat's with primary category of 'ask-mama' and category
        of 'live-chat'. The Chat date must be less than 5 days away, or
        happening now.
        """
        chat = None
        now = datetime.now()


        lcqs = self.get_query_set()
        lcqs = lcqs.filter(
            chat_ends_at__gte=now).order_by('-chat_starts_at')
        try:
            if settings.LIVECHAT_PRIMARY_CATEGORY:
                lcqs = lcqs.filter(
                    primary_category__slug=settings.LIVECHAT_PRIMARY_CATEGORY)
        except AttributeError:
            pass
        try:
            if settings.LIVECHAT_CATEGORIES:
                lcqs = lcqs.filter(
                    categories__slug__in=settings.LIVECHAT_CATEGORIES)
        except AttributeError:
            pass
        if lcqs.exists():
            chat = lcqs.latest('chat_starts_at')

        return chat