I have a vbulletin forum. I have a live chat on the forum that is open from 8 PM to midnight.
I would like to allow members to rsvp, to tell other members that they are going to be in chat tonight.
Only registered members should be able to add themselves to the list, and they can only add their own name.
I'm open to ideas on how to accomplish this, but it should be a fairly simple job.