Sub, a user from fr.wikibooks that I've been in contact with messaged me yesterday. He sent me a link to the Libre Software Meeting (LSM). The LSM is, from what I can gather, a conference for open-source software proponents. LSM will be held next year in the town of Nantes. Sub, living nearby, is on the planning committee for the event.
He suggested I go to the conference, and maybe take some time to talk about Wikibooks. I don't speak fluent French (or any French, for that matter), but he claims there will be plenty of English speakers in the audience as well. Sub also suggested that there might be the potential for some travel funding for the occasion, which would be a nice incentive if it materialized.
I was personally hoping to make it to OSCON next year, an open source conference that's a little closer to home (although not much closer, if it's in Portland again). My wikiwork would be just as relevant there and it would meld with some of my other OSS projects too. Since both are going to occur in the summer months next year I probably couldn't afford to do both (if I am able to afford either). Being half a world away again, I probably won't make it to next year's Wikimania either.
If any other Wikibookians--or Wikimedians for that matter--are near enough to Nantes France and want to help spread the word, this would be a cool opportunity.