 The Rhondda has hosted the National Eisteddfod on only one occasion , in 1928 at Treorchy . The Gorsedd stones that were placed to commemorate the event still stand on the <unk> hillside overlooking Treorchy and Cwmparc . In 1947 Treorchy held the Urdd National Eisteddfod , the Eisteddfod for children and young adults . 
