Quoi Faire a Paris?

I’m going to present our research on IT’s impact on competition and our ‘Full House’ hypothesis at the WISE conference next weekend, which is being held in Paris, lucky us. I haven’t been to the city in a year and a half, so I thought I’d shamelessly use this post to ask for advice.  What must not be missed in Paris these days?  What should be seen / eaten / drunk / experienced? 

I know I’m going to eat at L’Ami Louis (yes, we have a reservation), visit the Musee du Quai Branly, check out L’Eclaireur (less need for me to visit Zara now that we have a couple in Boston), and stay in the Marais. Beyond that, I’m open to suggestions, and eager to hear them. What are the best exhibits up right now (I’m sick that I missed Serra’s sculptures at the Grand Palais )? The coolest places for a late night out? Any good concerts happening Friday, Saturday, or Sunday?  I speak decent French, so there’s no insurmountable language barrier.
Let me know your suggestions, please.  If the place you’re recommending is so cool that the world must not know about it, feel free to email me. And thanks!