This will be fun.
So large dog crate with straw or shavings in our Gallery (which is closed this time of year and kept at about 60 F)? Clean water and food obviously. It will be 2F here tonight. Should we let him out with the girls this afternoon when we feed and let them forage or just keep him inside? Finally, and thinking ahead, any tips about re-acclimating him to outside? It's going to be frigid tomorrow.
He will have Pen and Pal to keep him company??

I would think that just one night inside shouldn't be a problem, but the vet will probably offer advise, if they are able to re-insert the penis. I'd also ask the vet what to do if it comes out and stays out again, after he is reunited with his girls.