Broomball
At Williams each year the sport of broomball is played so long as there is ice on the Lansing Chapman Rink. The IM version typically attracts between 500-600 people each year, making it the most popular sport played by all Ephs. If you've been to Williams, chances are you've been to a broomball match.
Typically, entries make up a large body of the IM broomball league, but "classes" in broomball are also offered during the winter for interested parties to play with other fellow broomball lovers.