“The present simple is frequently used for situations that often or regularly happen. It can therefore be used for a future situation that is part of a regular series of happenings:
The train for Berlin leaves at midnight tonight.
It is also used for something that is seen as part of a fixed timetable:
The sun rises at 07.34 tomorrow. (We can imagine the speaker thinking of a table of sunrise and sunset times.)
Emma sees Luke tomorrow. (We can imagine the speaker mentally looking at Emma’s diary).”
From:
Ways of Expressing the Future in English