WordPress.org

Simple attendance list, multiple lists can be added to any post or page and subscribed members can be edited.

Add an event in the admin panel with a name, description, closing date (for signing up) and registration limit (for number of users who can signup). You can then embed a form into any post or page using the wordpress shorttag [seatt-form event_id=x] (x = the event id).

From the admin panel you can read comments left by people who have registered, as well as boot them off the list or delete the list altogether.