We often use the simple present tense to talk about scheduled future event.
For example, The train leaves at 6 AM tomorrow.
Children go to school according to a fixed timetable that is set up by their school depending on the schedule.
Is it correct to say to your child "you go to school tomorrow" when that event is a part of a school time-table or she is scheduled to go to school tomorrow?
I don't know why not many native speakers want to answer this question, but I would expect a common expression that native speakers often say in this situation.