def METHOD_NAME(pk):
    """Notify users about event updation."""
    setUp()
    instance = Event.objects.filter(id=pk).first()
    if not instance:
        return
    users = User.objects.filter(id__in=instance.followers.filter(active=True).values('user_id'))
    notify.send(instance, recipient=users, verb=instance.name + " was updated")