Three of this year’s Mercury Prize nominees will perform together at a huge charity gig this autumn. Cat Burns, Corinne Bailey Rae and Ghetts, all of whom have recently been nominated for Album of the Year, are set to appear at More Life: Pass the Mic at The O2 in London. The concert has been organised by the Stephen Lawrence Day Foundation and will take place on what would have been Stephen Lawrence’s 50th birthday, with profits going to the foundation. The event features more than 12 artists representing Black culture and the community in southeast London where Stephen, who was killed in a r…