Since it was published two months ago, I’ve signed many copies of Our Oldest Enemy: A History of America’s Disastrous Relationship with France. But only a handful of copies have been signed by both me and my co-author, Mark Molesky. Tomorrow evening, Mark and I will be in the same place at the same time — a book fair sponsored by the Manhattan Institute and the Fabiani Society. Copies of OOE will be available, and the proceeds from our sales will go to the sponsoring organizations. There will be a bunch of other authors there as well. The event runs from 6 pm to 8 pm at the Harvard Club, 27 West 44th St.