cck master detail 1:n

Hi,
I am digging deeper every day, but find it hard to translate the drupal and cck world into concepts I know from database applications and their toolkits, so I would like to ask, if maybe anyone would like to explain, how to create a master-detail view in a form?

I am trying to connect users, locations and events (I am not the only one, as you can see in the event group) and I guess the nodeprofile package might be helpful with this, but I really would appreciate a short explanation if this can be done with CCK only...