Actually last week there was going to be an architectural event held in Paris (http://blog.fr.rhino3d.com/2010/06/architecture-et-formes-complexes...) presenting work done in Rhino+GH and Rhinoscripting. Unfortunately, the event was cancelled a couple of days before due to the massive strike held in France on June 24th (the day of the event), as a few of the keynote speakers were coming in from elsewhere and had train or flights cancelled. The event might be held later this year, I am not sure. You might want to keep an eye on our blog, http://blog.fr.rhino3d.com/.
Recently there were also a couple of Grasshopper trainings being held in Paris, http://blog.fr.rhino3d.com/2010/05/ateliers-grasshopper-paris.html. You might want to get in touch with the trainers organizing these courses, to see if they are planning anything else Grasshoppery related in the coming months.