Found the following on the internet:-

The School District of Osceola County, Florida
CALENDAR TO FOLLOW FOR ALL SCHOOLS IN THE DISTRICT
5 FRI FIRST DAY OF SCHOOL FOR STUDENTS
SEPTEMBER 5 MON LABOR DAY – TEACHER/STUDENT HOLIDAY 21 21 1
13 THURS TEACHER WORK DAY/STUDENT HOLIDAY
14 FRI TEACHER INSERVICE DAY/STUDENT HOLIDAY
NOVEMBER 11 FRI VETERANS DAY – TEACHER/STUDENT HOLIDAY 18 18 1
23 WED EMERGENCY MAKE-UP DAY OR
TEACHER NON-WORK DAY/STUDENT HOLIDAY
24 THURS THANKSGIVING – TEACHER/STUDENT HOLIDAY 1
25 FRI TEACHER NON-WORK DAY/STUDENT HOLIDAY
DECEMBER 16 FRI LAST DAY OF CLASSES – WINTER BREAK 12 12 1
END OF 2nd 9 WEEKS/1st SEMESTER ENDS
30 FRI TEACHER/STUDENT HOLIDAY 1
JANUARY 2 MON TEACHER WORK DAY/INSERVICE DAY/ 20 21
STUDENT HOLIDAY
3 TUES CLASSES RESUME-FIRST DAY OF 3rd 9 WEEKS
2nd SEMESTER BEGINS
16 MON MARTIN LUTHER KING, JR. DAY TEACHER/STUDENT HOLIDAY 1
FEBRUARY 17 FRI RODEO DAY 19 19
TEACHER NON-WORK DAY/STUDENT HOLIDAY
MARCH 9 THURS LAST DAY OF 3rd 9 WEEKS 17 18
10 FRI FIRST DAY OF 4TH 9 WEEKS
13 MON TEACHER WORK DAY/STUDENT HOLIDAY
20-24 MON-FRI SPRING BREAK
TEACHER NON-WORK DAYS/STUDENT HOLIDAY
APRIL 14-17 FRI-MON MID SEMESTER BREAK 18 18
MAY 23 TUES LAST DAY OF SCHOOL FOR STUDENTS 17 19
24 WED POST PLANNING
25 THURS POST PLANNING – LAST DAY FOR TEACHERS
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