I don’t know if it would be wise to drink in large quantities and ride. But there is this event that I heard about recently:
http://www.urbanbikeadventure.com/urban_bike_adventure/Washington_DC_Urban_Bike_Adventure.html
What is the Urban Bike Adventure?
The Urban Bike Adventure is designed for all skill levels, from the casual biker to the commuter to the triathlete, everyone can participate in this race. Teams of 2 or 3 ride around the city solving clues, completing challenges and racing to check points. The goal is to complete all the checkpoints and make it back to the finish line. This is a choose your own adventure race and you can complete the checkpoints in any order.
It’s a nationwide series of events. They are coming to DC on August 25. There are various prizes, including a special prize for “Most Unnecessary Mileage” (verified on GPS).