Create chatroom automatically via api?

I'm using Drupal 5.8, with Organic Groups and Chatrooms modules. I can integrate a chatroom with a specific group very nicely. BUT what I want to do is trigger the automatic programmatic creation of a chatroom each time a group is created by a user.
I'm sure I can add more php code to the OG creation code to insert chatroom data into the db, but is there a more elegant, Drupalesque way to hook the two modules together, or fire off an event from one to the other?