During the weekend of August 2-3rd, riders from Lexington will join up with more than 6,800 riders in the annual Pan-Mass Challenge, a two-day bike marathon across Massachusetts that raises an enormous amount of funds for cancer research and patient care at Dana-Farber cancer institute. Since its inception in 1980, the Pan-Mass Challenge has raised over $1 billion for Dana-Farber, making it the biggest contributor to the Dana-Farber cancer institute(JimmyFund).