I've heard back from Scribner regarding the TimesTalk appearance. There will be a total of 350 tickets available but they have already sold over 200 so if you're considering this event, you may want to act quickly. They are on a first come, first served basis but they feel that all seats have excellent sight lines and that the theater is small enough to give an intimate feel.
The ticket price is not including the purchase of a book and nothing has been set in stone yet about there being signed copies available at this event.
Thanks to Bev Vincent