Single Use Button

Can someone help me. I want to make a button that allows users to have a one click sign up for an event and add 1 value to attendance count but the users can press the button more than once messing with the attendance count. How do I make this button only be able to be pressed once

Add a user specific date column to the event table. Then change your button action to use a workflow that both increments the count and sets the current date to the user specific date column. Then change the visibility condition for the button to only display if the date is not empty or something like that.

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