It’s a tough decision, but you have about an hour left to buy tickets online if you’re still thinking about it. Christopher Hitchens will be at Kaufmann Concert Hall tonight at the main Y building on 92nd and Lex. Those indomitable food bloggers will be at the Steinhardt Building on the West Side of town. Hitchens. Food bloggers. Give it some thought. And you can always buy tickets in person at the last minute at either box office.