https://isdcalendar.com/

"Welcome to ISDCalendar, your go-to destination for seamless access to NYC ISD school calendars. Simplifying your life by providing free, printable PDFs for the 2023-24, 2024-25, and 2025-26 academic sessions, we're here to make keeping track of important dates and events in the New York City Independent School District a breeze."