New York Today: Empty Chair

By ANDY NEWMAN

Left, Hiroko Masuike/The New York Times; right, Michael Appleton for The New York Times

Joseph J. Lhota and Adolfo Carrión Jr. will debate without Bill de Blasio.

What you need to know in New York for Wednesday: a mayoral debate without the front-runner, cloudy skies and an art show for John Lennon’s birthday.