If you go to the WDW site, look under Discover to find Special Events. Osborne is listed there. They have a writeup with the date range and an asterisk:
November 10, 2009 — January 4, 2010*
The asterisk at the bottom of the writeup says:
*The Osborne Family Spectacle of Dancing Lights will not be featured on November 22, 2009.
It's kind of buried and I'm surprised I found it, actually! It would be the exact day we planned to go...
