Multi signups per node

Hi all,

My club meets up every week on Thursday for 2 hours from 7pm to 9pm. For each meeting, we have some roles need to be signed up, each role takes from 2 minutes to 15 minutes or so.

So the things we need to do is signing up before the meeting starts. it looks like this:

time roles member action
2 role1 signup
5 role2 signup
5 role3 signup

What I want to do is: when member click the button of "signup", under the "member" column will show his/her name and the "signup" button become " cancel" .

I am planning to make this as a CCK field, but before I start, I did a lot of search on drupal.org to avoid reinvent the wheel, but unfortunately, I did find anything can fit my needs(maybe I need improve my reading skill -:)).

Could anybody give me some clues? Thank you very much in advance!