Register and count participants to meetings

I have a car meetings app.
People do NOT have to login to the app.
It is under the Publisher Pro Plan.

I want people however be able to make their attendance know to the app.
(I checked appSheet support, and I am allowed to do that based upon Device-ID.)
(Yes, I know that the Device-ID is not stable, but that is okay for this case.)
(Yes.....if you know a better way, then please let me know.)

I want to make a button (action) in a meeting details view that says "Are you attending?".
When the user presses that, the device ID is stored and the action status is stored.
(This way it is still anonymous)
The button name changes to "I will be there." (Maybe the color will change too)
Off cause, the meeting counter will be increased by 1.

If the user presses the button again, it will change to "Not attending".
The meeting counter will show 1 person less. (And maybe the color changes again)

My problem is......I have no clue how I start this.
It seems logical that I should create a new table that stores the user status for each meeting, based upon the Device-ID.
How can I connect the user to a meeting and vice versa for the count?
How would that construct best be set up?

Would somebody please give me a push in the right direction?
(A sample app would be so great.)

Sorry if I ask to much, but I hope somebody is willing to assist me a bit.

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Hm.......it's a tuff problem.
That much is clear to me.

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