The organizing team of the ECSC 2018 changed recently and there is now a change in the venue of the event. Such a last-minute change is of course regrettable, but there were no alternatives left to the WFCC and it had to be accepted. /Harry Fougiaxis, the President of WFCC/
You may see the Official Invitation by RCF published, linked also to the Solving page, ECSC section.