There have been many other threads on this subject - or probably I should say these two subjects, because there are two entirely separate kinds of issues here that have been discussed very often and where people's opinions tend to differ a lot:
1). To what extent do you (we) even write down familiar, repetitive actions? Some people write down even the most commonplace things, like eating meals, watching movies, reading novels, taking their daily medicins etc etc, whereas others (I am one of those) try to limit this. I think it is much easier (for me) to just sometimes assess such things in retrospect - have I exercised enough, have I eaten nutritiously enough, etc.
2) To what extent do you use the calendar for ordinary next actions? Some people put next actions, that are not inherently date-bound in any way, on their calendar to give it extra focus or prominence. Longstreet apparently has taken up that habit and nowadays argues for its benefits. I myself not not use that practice; I find it counterproductive (for me).
In your specific case, wanting to remember to practice enough before your recital on October 1, I would probably manage without much administration at all. I would probably write "Piano practice" on my next actions list, make sure it is visible (high up on the list or color marked etc). I would not check it off until the recital, so there would be only one action line representing all the instances of practice.
I would also put "Piano recital" on the calendar for Oct 1. The recital itself unquestionably is a GTD hard calendar date.
I would probably remember to practice even if I did not write it down anywhere, but with these two entries I would definitely be confident that I will see this thing (and be reminded of it) often enough whether I look at my next actions list or at my calendar. I would not bother to create separate items for each day's practice.