Silverstar reports about the post-signing moot starting here, and along the way cites the fact that Kit Harington (who was exhausted) and Alfie Allen didn’t attend the event, but that the rest of the cast who had been present at the signing did, as well Esmé Bianco and (briefly) Rory McCann (who plays Sandor Clegane). There was also a marriage proposal at the event, with a bit of assistance from GRRM himself!
We also have a lengthy report from Adam Whitehead, who maintains the excellent Wertzone SF/F review blog, which you can find here. Biggest piece of news there? While George cautions HBO could still pass on it, he also said that there’s the possibility of a two-season advanced order! It’s a remote possibility, but the fact that it’s even on the table is remarkable—HBO generally only commits to shows a season at a time, and it can take several seasons before they’re willing to go further than that.
UPDATE: Silverstar’s shared her terrific collection of photos from the signing and the moot. Many thanks! Some excellent shots of GRRM, Parris, and the cast.