I heard this being discussed on Radio Cymru today and it sounds great if you like choir music. There is an opening concert in the Tabernacle in the Hayes, Cardiff, on Friday night, and they will have tickets at the door - only £5 I believe.
Then there will be choir competitions all day Saturday in the BBC Hoddinott Hall, c/o Wales Millennium Centre, CF10 5AL Cardiff with different categories, and the overall winning choir getting the Karl Jenkins Trophy plus £2,000!
https://allevents.in/org/international-choral-festival-wales-gŵyl-gorawl-ryngwladol-cymru/14862585#