Reschedule my BoF?

I've proposed a Bof, http://paris2009.drupalcon.org/session/drupal-facebook-hackathon. I see that it has been added to the schedule, which is great.

However, it was added to the same timeslot as this session: http://paris2009.drupalcon.org/session/social-stack-fun-profit. Both sessions are about adding social features to Drupal sites, and will attract the same audience. In fact, I really want to attend one and host the other. So I don't want these two at the same time.

Is there anything I can do to reschedule my BoF?