A Blimp in Ann Arbor

As I was heading into work this morning, I saw a blimp flying around.  Sadly, it was not in a place where I could get a picture of it.

As I was heading back to the office after picking up lunch, I saw the blimp heading back to the airport.  I ate my lunch and decided to go over to the airport.  I was able to catch it at the blimp tether.

I'm pretty sure it's here for the Ann Arbor Art Fair for some reason, but I don't know why.