Again thats not the organisers fault. In france whenever you wish to take part in sport organised by a third party (ie events etc; especially active competition ) you have to have a medical and or letter from doctor indicating you are perfectly fit and well to take part.
Locals will be well aware of all this. Pretty sure Defi will insist on something.!!!
Suspect foreigners might roll up expecting to sail and be hit with this one !!! Make sure you check if you do register !!!!