Return the second part of the event_type

        e.g.

        >>> Event.event_type = 'experiment.deleted'
        >>> Event.get_event_action() == 'deleted'

def get_event_action(cls) -> Optional[str]:
        """Return the second part of the event_type

        e.g.

        >>> Event.event_type = 'experiment.deleted'
        >>> Event.get_event_action() == 'deleted'
        """
        if not cls.actor:
            return None
        return event_context.get_event_action(cls.event_type)