Drupal 6 -- Venue / Facilities / Space scheduling/management module?

Hey everyone,

So either a solution doesn't exist, or I can't find a way to properly write out the keywords to find the solution I need in google. Anyways, I'm looking to find a module or module set, or even a solution using the basics (CCK, views, etc etc) allowing for management of facilities / rooms. For example, say an event space with multiple halls wants to only be able to schedule facilities for one event at a time, and wants to be able to see them all, and there will be set rules concerning overlap and what not.

Any ideas? Perhaps a solution you've done yourself in the past?

Thanks in advance for your help everyone!
Jesse