religious holidays : Muslim families should n't have to weigh secular vs. religious holidays . Bill de Blasio had pledged to adopt the liturgical calendar during his mayoral term . New York City 's public schools already observe Jewish and Christian holidays .
School chief : Muslim families should n't have to weigh school vs. religious observances . Bill de Blasio had pledged to change the school calendar during his mayoral campaign . New York City 's public schools already observe Jewish and Christian holidays .