This Saturday, Raj Haldar (aka rapper Lushlife) and Chris Carpenter (tech genius) will entertain us with their hilarious new book, P is for Pterodactyl: The Worst Alphabet Book Ever. Raj and Chris will read, rap, sign books, and, of course, help kids create literary and visual syzygies from their favorite worst and wacky words. Hosted by Yvonne Brooks. All ages welcome; best for ages 5 to 11. Free.