def METHOD_NAME(apps, schema_editor):
    NewsletterContent = apps.get_model("newsletters", "NewsletterContent")
    contents = NewsletterContent.objects.all()
    for content in contents:
        item = content.newsletterevent
        item.title_en = content.title_en
        item.title_nl = content.title_nl
        item.description_en = content.description_en
        item.description_nl = content.description_nl
        item.save()