No shopping, no kitchen clean-up, no calories to work off! This annual fundraiser by the Princeton Library Friends runs through May 31. How does it work? Estimate how much you'd spend for baking ingredients, factor in the value of your time, and make a comparable donation to the Friends. Also, mark your calendars for Saturday, July 16. That's when the Library Friends will host the concession stand at the Princeton Flea Market. Please stop by, e-mail, or call the library for more information.