[asshanson]

Some interesting info:

I got a group of friends going to Level tonight, emailed the guest list, and I immediately got a reply from them saying the guest list service was no longer in use because it got so popular. Instead they moved to a password system.

So all you will have to do is email them that day saying you have a group, they send you the password for the night, then you could post the password for everyone to use.