Here is the event website, where you can find information about the various speakers and performers, as well as buy tickets
And this is the excerpt related to Ronnie’s participation:
RONNIE O’SULLIVAN IN CONVERSATION
Mon 13 Jun / 17:45 / Crucible Theatre
We welcome the maverick and phenomenally gifted snooker player Ronnie the Rocket back to Sheffield for a talk with Guardian journalist Simon Hattenstone. Never hiding the fact that he came from an imperfect background and daring to be critical of the snooker world at large, Ronnie O’Sullivan has always been an incredible player and fascinating public figure. Hear about the documentaries that have inspired him throughout his life and snooker career.