public class ScheduledPageEventReceiver : SPItemEventReceiver
{
    protected void HandleScheduling(PublishingPage page)
    {
        Type t = typeof(PublishingPage);
        MethodInfo notificationMethod = t.GetMethod("UpdateNotificationList",BindingFlags.NonPublic | BindingFlags.Instance | BindingFlags.InvokeMethod);
        if (notificationMethod != null)
        {
            notificationMethod.Invoke(page, null);
        }
    }

    public override void ItemUpdating(SPItemEventProperties properties)
    {
        if (properties == null)
        {
            throw new ArgumentNullException("properties");
        }
        if (properties.AfterProperties == null)
        {
            throw new ArgumentNullException("properties.AfterProperties");
        }
        object status = properties.AfterProperties["vti_doclibmodstat"];
        if ((status != null) && (Convert.ToInt32(status, CultureInfo.InvariantCulture) == 0)) //Approved
        {
            using (SPWeb web = properties.OpenWeb())
            {
                SPListItem item = web.GetFile(properties.BeforeUrl).Item;
                if (PublishingPage.IsPublishingPage(item) && PublishingPage.IsScheduledItem(item))
                {
                    PublishingPage page = PublishingPage.GetPublishingPage(item);
                    HandleScheduling(page);
                    return;
                }
            }
        }
    }
}