I checked with the Millhopper branch of the public library tonight, and they are booked except for one hour on 19 Nov, and booked all day on 17 Oct.
They say that you can book for the current month and the next two--ie, on October first you could have booked for December, and they say that the best time to book is the first day you can do so.
FWIW, the Ubuntu fest is a Wednesday, and the Mandriva fest is a Monday. There's less than two weeks to plan for the Ubuntu fest. (and that's if you don't plan any publicity....)
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