I guess you noticed the JI Case building in the background. They are still in business and were located in Racine Wi. They made thresher machines and tractors along with that car which was manufactured in 1911. If you Google them you will find they have an historical heritage group. I am sure they could help with shedding more light on that event. That is an awesome photo. I am certain they will take a great interest in it.
Please let us know what you find out