return array(
    'areas'       => array(self::HAS_MANY, 'EventArea',          'event_id'),
    'areaArtists' => array(self::HAS_MANY, 'ArtistEventAreaRel', 'event_area_id', 'through' => 'areas'),
    'artists'     => array(self::HAS_MANY, 'Artist',             'artist_id',     'through' => 'areaArtists'),
  );