Give availability

I need to integrate my application with a space dedicated to immediate availability.
I would like each person to be able to independently submit their availability to participate in an event when an alert is issued. My idea was to create a dedicated screen: a button that, when pressed, sends the name associated with that phone to a list / sheet.
Eva pressed the button
Ariel pressed the button
Jack pressed the button.
Everyone receives a confirmation message.
the event coordinator receives the list of people who have pressed that button, therefore:

it's possible?can help me with the code?
(it is important to be able to organize within my voluntary civil protection association)

Sounds like you want something like a broadcast hub. See here for ideas....

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