0 used to show that something is in a position above something else and touching it, or that something is moving into such a position: --
1 covering the surface of, being held by, or connected to something: --
2 used to show when something happens: --
Please leave your key at the reception desk on your departure from (= when you leave) the hotel.
She was dead on arrival (= dead when she arrived) at the hospital.
The bells in the clock tower ring every hour on the hour (= at exactly one o'clock, two o'clock, etc.).
Would you mind telling me what you were doing on the afternoon of Friday the 13th of March?
My birthday's on 30 May.
What are you doing on Friday?
3 used to show where something has been written, printed, or drawn: --
4 used for showing some methods of travelling: --
5 used to show that a condition or process is being experienced: --
Having found a replacement venue, the concert is now back on.
You go on, I'll catch you up.