Here in Pittsburgh our Bike Club has an annual "Light Up Night" ride the Friday before Thanksgiving when the city lights up all the buildings as a prelude to the holiday (shopping) season.

A few riders have come with bothe themselves and their bikes festooned with strings of lights pretty much like your photo. One had a motorcyle battery fastened to his rack just to operate all of the lights. It certainly caused a lot of comments from all of the others.