But ACS didn't tell teachers about the switch from a holiday to a work day until May 12, just two and a half weeks before Memorial Day. “Dr. Dickerson informed employees about our school calendar issue once it was brought to his attention by our legal counsel,” ACS spokeswoman Ashley-Michelle Thublin said. Mark Dickerson is the ACS assistant superintendent of administration The "calendar issue" Thublin is referring to was a miscalculation of holidays that Dickerson informed staff about via email May 12. Per state law, the only holiday school districts are required to give their teachers and staff off is Veterans Day. Further, public school employees cannot have more holidays than state employees. This year, that was 12 days. The ACS 2020-21 calendar, released last school year, included 13 holidays for staff and students.