Event listing with attendance status


I’m building an event listings website. Currently my no code stack is Webflow + member stack.

One my site, when a user is logged in, they can click ‘join’ to confirm that they are going to attend an event. The events are created from a CMS collection.

I have built this bit and the data is saved successfully.

What I now need to do is the following:
Once the user has clicked the ‘join’ button, the ‘join’ button should be hidden (event if they log out and back in again) and a new message displayed which says: ‘I’m attending this event’

What would be the best way to achieve this functionality?