After reading the thread on unicycle plates, I ordered one for Carl Hoyer and one for myself.
Check them out here:
If you have a unicycle plate, bring it to the NAUCC and we will get together for a photo.
If you are not driving, take one off your car and bring it along. 
I know Dustin Kelm has one.
Thanks to Pete Groves for the photo’s !
Cheers,
Darren