The good news is that MDRF is about 2/3 under tree-cover. When it gets really rainy, most of the danes will bug out, and then there's room in the taverns for the garbed playtrons.
But we'll just have to see what the hurricane does.
I'm thinking that if it's looking like a good chance of rain, I'll be leaving the mail chausses, elbows/knees, and helmet off. That lets me wear my tall boots (mud is no problem), and not worry about my steel bits rusting. Everything else is fine in the rain-- aluminum mail, linen surcoat, leather bracers, etc.