Here are the:
2018-2019 Academic Calendar: http://dft231.mi.aft.org/sites/default/files/article_pdf_files/2018-09/2018-2019_academic_calendar.pdf
Letter of Agreement regarding 2018-19 Academic Calendar: http://dft231.mi.aft.org/sites/default/files/article_pdf_files/2018-09/letter_of_agreement_.school_calendar_and_prep_periods_.pdf
Unfair Labor Practice document: http://dft231.mi.aft.org/sites/default/files/article_pdf_files/2018-09/ulp_charge_-_draft_attachment_statement_of_charge_-_08.03.18.pdf