For the past three years, the League of American Bicyclists have held the above-mentioned challenge.  Rather than explain it, allow me to quote directly from the challenge website.

“The National Bike Challenge is a nationwide event uniting  thousands of current bicyclists — and encouraging countless new riders. In its simplest form it is a logging center for users to record miles ridden and be part of the national community of bicyclists. It is a free and easy way to challenge yourself, colleagues and the greater community to ride more. Users compete on a local, state and national level. The Challenge aims to unite 50,000 riders to pedal 30 million miles from May 1, 2014 until September 30, 2014. Now in its third year, the Challenge is a successful partnership between the League of American Bicyclists and Kimberly-Clark’s Scott Natural Brand.”