At any ranking event in almost any class you'd expect some form of measurement checking to take place.
At the two previous F16 GCs measurement checks were made prior to the event. This is NOT full measurement, it's checking certain items eg at Zandvoort boats were weighed and mast tip weights were checked, new sails were measurement checked and boats were visually inspected to ensure there wasn't anything obviously out of class.

I believe that arrangements for these sorts of checks at GYC are currently being worked out by the organisers. You guys shouldn't get yourselves into a tailspin over this, it's merely trying to ensure fair competition and avoid any ill feelings and accusations being thrown around post-racing!
Hope you all have a really great time! I'm so sorry and also jealous that I can't be there