生け花をします does it mean to practice flower arranging?


In my Minna no Nihongo book (Chapter 12), it says that `生け花をします` means to
practice flower arrangement. If that is so, they how do you expressing,
"flower arranging or arranging the flowers or doing flower arrangements"? An
example sentence.

  * X: What are you doing right now?
  * Y: I'm doing flower arrangements for tonight.




Here is my guess, but please forgive me if it contains mistakes:

> X: What are you doing right now?
>
> Y: I'm doing the flower arrangements for tonight.
>
> X: 今、何してんの？
>
> Y: 今晩のため、生け花をしています。

But if you are interested in a more ambiguous meaning:

> Y: I'm doing flower arrangements for tonight.
>
> (could mean practicing them for later tonight or actually doing them for
> tonight)
>
> Y: 今晩の生け花をしています。

Edit: I had suggested 今晩の生け花をしておきます as a possible translation, but upon
hearing other opinions, I think this would mean "I will do the Ikebana
arrangement for tonight." For further examples of ~ておきます see:
<http://j-learning.com/diapo//L30diapo.pdf>

In your quoted example, します can mean "practice," but does not explicitly mean
this. 生け花をします can also mean "to do Ikebana flower arranging." For a more
explicit expression of practice, one can use 練習.

As per Taro Sato's example:

> 今夜の生け花の練習をしています。
>
> I am practicing Ikebana for tonight.

