What time would be reasonable to show up without camping overnight/days in advance? Any chance at all of meeting him by showing up that morning (as in 8-9 AM)?
Based on Sweden, and the fact this signing is for midday, I doubt you would have a chance if you get there that late. I mean, it's possible - but super risky. This could be his only US signing, and some fans will be travelling from hundreds of miles away for the chance to meet him. If you aren't queuing overnight, I would at least get there early in the morning. 6-7am, rather than 8-9. It depends on how much you want to meet him, and how much you want to chance it and possibly miss out.
Another more ominous update, this time from the B&N Union Square store manager:
"Oh my god work crisis we are in the deepest shit ever"
Well, this isn't looking good. Sucks.
I doubt the event was never happening in the first place as some people seem to be suggesting. My guess is they tweeted about this prematurely and for whatever reason the shit hit the fan.
9am on the day? You'll have no chance. He's only signing for 2 hours, so only the first couple of hundred people in line will get through the doors.
People who turned up at 9:30am in Gothenburg never made it inside, and I would expect the queue in New York to be twice the size of that one.