Audrey Niffenegger will be signing her new comic book, The Night Bookmobile on Sept 18th at 3:30 pm.
Jules Feiffer and Norton Juster will be signing The Odious Ogre at 11 am on Sept 26th.
Not a comics writer, but science fiction author William Gibson will be there later the same day at 1 pm.
Here's an NPR piece with Feiffer:
Hansen, Liane. 2010.
'Phantom Tollbooth' Creators Reunited By An 'Ogre'.
National Public Radio's Weekend Edition Sunday (September 5).