What is the difference between さて、昼にしましょう and さて、昼をしましょう


What is the difference between:

「さて、昼 **に** しましょう。」

and

「さて、昼 **を** しましょう」。?




...にする is a set expression indicating a choice one has/will make.

> さて、昼にしましょう

> Well, how about lunch?

* * *

There was a time when saying things like _let's do lunch_ or _let's do dinner_
were viewed as horrible California-isms. It seems they've managed to have
established themselves more broadly in English now.

But, in Japanese, saying

> 昼をしましょう

while this is technically _grammatical,_ as pointed out in the other answer,
it doesn't make much sense. (I was perhaps a bit careless in my use of the
word, _grammatical_ , previously.) 昼 here is being treated as the object of
the verb する; you don't do _afternoon_ in Japanese (even if you can make some
kind of sense of that expression in English).

