Amy is scheduled to appear on Late Night with Conan O’Brien tomorrow night, Thursday, September 11th. (Though if you’re setting your Tivo or VCR–remember that it’s technically Friday the 12th.)
And yes, she really will be on the show this time (this is a rescheduling of the August 28th appearance that she had to cancel). I know this is really late notice–If you miss it, you should be able to watch it on NBC.com .
Edit: You can watch it here for a limited time.