What is rumble on 44th street?

As an AI language model, I don't have access to all current events or activities. However, if you are referring to the Rumble on 44th Street event in Grand Rapids, Michigan, it is an amateur boxing event that takes place annually. In this boxing event, amateur boxers from different skill levels and age groups compete to showcase their skills and gain experience. It is a popular event that draws a large audience and provides an opportunity for young boxers to display their talents.