the "install hack" used on vB.org

[Koss]

hi,

I need a feature very much similar to the "install hack" feature here on vb.org

But im not going to use it for install purposes, instead I can use it when members post certain events. If another member is attending the event they can click on "attending" (or whatever other name i can come up with) hence on every event there would be a total number of people going to the event and maybe even their names....

-thanks for your help