It's a cancer fundraiser started by Chicagoan David Linn and his wife Jennifer.
Jennifer died in 2011 of a rare form of sarcoma.
Since its inception in 2007 the annual event has raised more than $42 million for rare cancer research.
It's a cancer fundraiser started by Chicagoan David Linn and his wife Jennifer.
Jennifer died in 2011 of a rare form of sarcoma.
Since its inception in 2007 the annual event has raised more than $42 million for rare cancer research.