Shared Calendar and database

I'm trying to do an app which aims to create calendars and share them with different person (with family or friends for example).
For that I need to create a database (with firebase), and I have a table called "Calendar". There's also a table for users which contains a list of calendars. A user can owns many calendars.
Concerning calendars on the page, I use this package : https://pub.dev/packages/table_calendar
The problem is that I don't know how to display all the calendars of the current user authenticate.
My page looks like this :

I want to display the calendars depending on the calendars register into the user's document.

Is there a way to do that ?

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