IN or ON?

[hela]

Dear teachers,

1) Is that true that we can say "IN Saturday nights" in English, to insist on "night" rather than "Saturday"? If yes, should "night" be in the plural or can it also be in the singular?

Would you please give me example where we can use In instead of ON in a similar case?

2) Is it possible to leave out the "on" in the following sentence?

a) What about going to the restaurant on Saturday evening ?
b) What about going to the restaurant Saturday evening ?

Many thanks,
Hela

[Mister Micawber]

.
1-- Not true.
2-- Yes, it is possible and common.
.

[hela]

Thank you :)