Ive tried a variety of butt balms and decided i like lantiseptic the best. I can bring you a few packets. I scrambled to order fenders and am hoping to install them well enough tomorrow. Rain jacket, wool, and enjoying the ride; riding in the rain is not a whole lot different. If its a grey or rainy day, i run my rear lights all day, so will bring extra batteries. I have in the past covered my saddle with plastic bags, but, dont feel the need with fenders. Some people put their feet in plastic bags in their shoes, I obviously just wear sandals, and may apply some lantiseptic to the top of my foot near the straps.
basicaly riding a 600k in the rain is just like randonneuring in any other enviroment/situatin. Eat, drink, and be merry, while pedaling.