Illustration: Brando Celi On February 24, as snow blanketed city sidewalks for the second day in a row, mayor Zohran Mamdani’s seemingly unflappable charm offensive met its first formidable foe: the public-school calendar. It was clear to many in the outer boroughs, where snowplowing had lagged, that thousands of students and teachers would struggle with their commutes if the buildings reopened that day. But Mamdani also knew that a snow day would cause the city to fall short of the 180 days of