This is not the fault of the schedulers who create the calendar for City Schools. We attend school through December 23rd before Christmas. We have a full day of school on the Wednesday before Thanksgiving. Of our 10 Professional Development days for the year, 4 are held before the school year begins, and 1 afterwards, meaning there are 5 sprinkled throughout the 10 months of the academic year: these days are critical (and too infrequent) to meeting with vertical and horizontal teams, moderating assessments, and learning new policies and technology. We have the standard holidays off: Labor Day, Election Day (because the schools are used as polling places), Thanksgiving, MLK Day, President's Day, and Memorial Day. All of this adds up to around 135 days of school to prepare students for a rigorous college-level exam.
Forcing schools to open after Labor Day would force another five days to be shaved off that instructional time, just for the Maryland students and schools that politicians that schools are threatening to inflict this law upon. As we endure another weather-related interruption out of our control, why would we intentionally put our students five days behind students in other states who have the same testing date, which is the same throughout the world for the International Baccalaureate. But this isn't an isolated single test. All IB, AP, PARCC, and SAT exams are the same date, or dates, throughout the academic year, and there's no reason that Maryland students should be forced to have less classroom time than other students in preparation for any of those tests.