Fiddling with a heart-print pencil in one hand and a New York Times bestseller in the other, Ameet Kamath waited for his date – a fellow book lover – to pop the question: “Will you explain why you chose this book?” Blake Love asked, like two dozen others at the Main Library’s literary speed-dating event Wednesday, as he leaned in to examine Michael Gruber‘s thriller “The Book of Air and Shadows.” “It says it’s ‘breathlessly…