Here in San Diego only 28 vehicles are signed up. Nissan Leaf - 4 (one is ours), Tesla Model S - 2 (one is ours).
Sign up soon for an event near you. Be sure to talk it up with your friends, family, and co-workers. We have a great event each year here in San Diego and I am sure it is a lot of fun where you live also.
Here is the link for the national program:
Here is the link specific to the San Diego, CA EVent:
Hope to see you there.