I can't believe I missed this - granted, I live in Cambridge not New York City - but it would have been worth the trek!
The New York Teen Author Festival gathered together multitudes of young adult writers across the boroughs for readings and symposiums. Authors from Barry Lyga, Maggie Stiefvater, and John Green to Melina Marchetta, Matt de la Pena, and Gayle Forman read, performed (I never knew Libba Bray was in a band called Tiger Beat!), and led talks on writing. If you went, I am incredibly jealous and I hope you'll come by and tell me stories. If you also missed it, there are some great articles up about it - I like the videos (and E Lockhart's tights!) on Random House's Random Buzzers website.