Raw eggs... safe or not?

its a risk, but unless you are giving it to children, elderly, or immunocompromised, I'd be OK with taking the risk. They make pasteurized eggs, but I find them very difficult to whip.

she said one of the guests is 72

OP I would inform your guests as to how this is made, and ask if anyone wants an alternative. Then it's their informed decision. Especially re the kids and elderly people. Personally, I don't mind taking risks with stuff like this, but I'd rather the decision was made by me, not on my behalf.

ETA: also, can't you get eggs that are laid by chickens who have been vaccinated against salmonella?

Mhm, this is most definitely true. Said person of 72 is in excellent shape and health (for her age nevertheless) but I most definitely desire to risk her life... Nor the ones of others (despite being pretty sure myself of the way the recipe is handled)... I guess that I will let them decide. I know that they do not see anything against the recipe being realized the night before however.

And well, food labels aren't as precise in France (or at least in the area I live in) and I have to admit that I have not found such eggs for the moment... But that might be due to a lack of focus on my part