Last Day of School (Sullivan County Schools) Post author By Thomas Gould Post date May 25, 2023 When 05/25/2023 All Day Add To Calendar Download ICS Google Calendar iCalendar Office 365 Outlook Live Event Type School Cal Online bookings are not available for this event. Back to Annual Calendar ← 2023 Spring Break (Kingsport City Schools) → 2022 Christmas Break (Sullivan County Schools)