When we speak about work of different institutions, for example, cinemas, theatres, banks, shops, supermarkets, exhibitions, we must use only The Present Simple Tense although an action will take place in future.
The exhibition opens on the 12 of May. (It is only March now)
The bank opens tomorrow.
The same rule is applied when we speak about timetables and schedules. All kinds of transport run according to a schedule that's why we use The Present Simple Tense.
The ship arrives at 7 in the evening. (It is only 8 o'clock in the morning)
According to English grammar we should say "The Prime Minister is returning to London on Saturday."
But when it is a newspaper headline we usually use The Present Simple Tense.
Headlines tend to attract people's attention that's why they are short.
We use only The Present Simple when we speak about natural phenomena.
The Sun rises at...
This action doesn't depend on our decision. It will take place anyway.