This was the first of the Girls in Bleau events that we ran with Caroline Sinno. It was a super fun day, with a surprising amount of dry rock in this quick-drying area. We did need to be very selective to avoid any potentially delicate holds, but the psych was high, and we found lots of fun problems.
Rain sucks, but broken holds suck even more. Remember, never climb on wet rock in Fontainebleau.
The sandstone becomes brittle, and pulling on it will ruin classic problems. Drying it doesn't help, because it's still wet and weak inside.
All you can do is wait for better conditions.