Collections of shows with multiple date performances

Hello everyone,

I am working on a project for a theatre company. I have multiple shows with multiple dates of performances.

I have organized my pages:

pages

• Shows
  default.md
  • Wonderful Show 1
    show.md
    imageoftheshow.jpg
    • performance1
      performance.md
    • performance2
      performance.md
  • Wonderful Show 2
    show.md
    imageoftheshow.jpg
    • performance1
      performance.md
    • performance2
      performance.md

default.md should contains a collection of shows and dates of performances
show.md contains the description of the show, title etc...
performance.md only contains the date of the performance and eventually additional information for the specific performance.

I want to make a collection of performances ordered by date but grouped by show.

Is my folder organization of pages ok ?

I tried to make a collection in default.md:
content:
items: '@self.descendants'
order:
by: date
dir: asc

Now I have all the shows and performances but I don't know how to group and order them correctly.

Thanks for your advice
Matthieu