def run(self):
        self.importer.print_success('Importing {}'.format(self.old_event), event_id=self.event.id)
        self.event.references = list(self._process_references(EventReference, self.old_event))
        self._migrate_event_persons()
        self._migrate_event_persons_links()
        self._migrate_contribution_types()
        self._migrate_contribution_fields()
        self._migrate_sessions()
        self._migrate_contributions()
        self._migrate_abstracts()
        self._migrate_timetable()