St David’s Hall Sunday 8 May 7.30pm   GET ready for a rip-roaring journey through the Seven Kingdoms as the ultimate Game of Thrones parody comes to St David’s Hall!   Yet, this is the wildly popular HBO show as you’ve never seen it before. Fresh from a sold-out five-week run in the West End, Graeme of Thrones is at the National Concert Hall of Wales for one night only on Sunday 8 May at 7.30pm.   This hilarious production…