In case anyone missed the email from Larry, please see the note below from Timothy Clark, the 2009 Invitational Volunteer Coordinator.

As the 2009 Invitational Volunteer Coordinator I would personal like to invite you to the Invitational which will be held in Ohio this year. You could have front row seats to NAVHDA’s flag ship test. Being that you live here in the East it will only be a short drive away. If you have never experience this event it is a great way to see it. There are many jobs that need to be done every day. If you think that some day that you will be running in the Invitational this is will give you first hand experience which will be invaluable.
Whether you are handling a dog, or coming as a spectator, working at the Invitational is not only a fun and productive way to see great dog work, it is an outstanding way to learn more about this test. The Invitational is an International event, which means each of us plays a part in its success. At the least, if everyone who handles a dog, volunteers to work at least one day, there would be a sufficient number of workers. This test requires 40 workers per day. Workers need to be on the grounds by 6:30 every morning to meet with their site marshal.

Here is the link that you have to go to volunteer.
http://www.navhda.org/invhome.html