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Is there an existing plugin that can do this?
Or maybe develop something simple with a button that a user can click to mark their account somehow (add a new field to the users table? Or make a new table with a list of users who clicked?) so I will know they clicked it. Then I would like to be able to download a list of all users who clicked the button (could also just do a DB query or download the new table). Would like to be able to make sure users could only click once, but that’s not important since I could summarize the table later if a user clicked multiple times.
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One method: Use “Restrict Content” plugin, and a form builder (e.g. Ninja Forms). The form is only visible to logged in users. The form consists of only a submit button. When submitted, the user’s info is saved into the Submissions (Ninja Forms can be setup to do this automatically). You then have a list of everyone who ‘entered’.