def _check_warn_threshold(self, time_to, event_dict):
        """
        Checks if the time until an event starts is less than or equal to the
        warn_threshold. If True, issue a warning with self.py3.notify_user.
        """
        if time_to["total_minutes"] <= self.warn_threshold:
            warn_message = self.py3.safe_format(self.format_notification, event_dict)
            self.py3.notify_user(warn_message, "warning", self.warn_timeout)

        Checks if the time until an event starts is less than or equal to the
        warn_threshold. If True, issue a warning with self.py3.notify_user.
        
py3status/modules/google_calendar.py