This is something you will have to take up with the Moot organisers (http://moodlemoot.org/course/view.php?id=6). I suspect that there were multiple considerations when choosing the date, and they could not find one that would make everyone happy.
Is there no way for you to get out of school for a couple of days?
Quiz
What should I talk about at the San Francisco MoodleMoot
Eztabaida hau blokeatu da eta beraz aurrerantzean ezingo duzu bertan erantzun.