1. When we know about the future we normally use the present tense.
We use the present simple for something scheduled or arranged:
We have a lesson next Monday.
The train arrives at 6.30 in the morning.
The holidays start next week.
It is my birthday tomorrow.
- See more at: https://learnenglish.britishcouncil.org/en/english-grammar/verbs/talking-about-future#sthash.oObN0Ogi.dpuf