It is a pop-up city within the capital city that celebrates the best of Welsh culture. The National Eisteddfod, the biggest cultural event in the Welsh year, comes to Cardiff. It is a snapshot of what is happening in Wales, showcasing everything from the classical music stars of the future to rock bands, folk music, dance, cutting-edge contemporary visual art, literature and much more.Jason Mohammad, himself a local lad, heads down to Cardiff Bay to bring all the highlights and stories from the 'maes' - usually a field but this year an open-to-all festival - no ticket required.The pavilion - traditionally a large tent and the heart of the official competitions - is this year the Wales Millennium Centre. Bryn Terfel stars in a show about American singer Paul Robeson, while Wales and Lions rugby player Jamie Roberts finds himself joining the 'Gorsedd'.Jason brings us a flavour of what has been going on this year - a year like no other in the long history of the Eisteddfod.