Last aired 2011, and most episodes are gone from the Web altogether. Dunno why he'd make a panel about it now.
I see two options:
-Black thinks his long-dead show still has fans who'd want to attend a panel about it. He still raves about his show having been a super comedy smash hit (remember how half the Gen Zed trailer was about GNB?). Maybe he thinks the name Goodnight Burbank alone will attract hordes of adoring fans. We all know the man's delusional.
-Or he's more or less given up on GZ, at least for now. Instead, he has autistically decided to fall back on old recipes and give yet another try at reviving GNB. It's pretty obvious he sees it as his masterpiece, and it's the only show of his that got the slightest amount of success. Since he thinks recycling the same shit over and over will get it to work somehow, it wouldn't surprise me if he chose to try and raise GNB back from the dead one more time.