Simple attendance list open for everyone

I want to have an option on my site, where users can write there front and last name, and then attend to an event. The list of attending users should be public, and show up next to the form where you enter the front and last name.

I think it is a very easy setup, but i can't find any plugin for it.

I found this plugin:
-but here, the user needs to be logged and to both view the list of attending people, and also to attend themselves.