The Royal Cornwall Show is held at The Royal Cornwall Showground PL27 7JE during the first week of June.
The Cornwall Show Blacksmiths schedule can be downloaded here https://www.royalcornwallshow.org/competitors/blacksmiths/
If you can’t find the information you were expecting… try this link https://blacksmithcompetition.wordpress.com/nbc/participating-shows-schedules-and-events/