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poker run

n. (context motorcycling English) A motorcycling event where each participant pays a fee, and then follows a course with checkpoints, at each of which a playing card is drawn. At the last checkpoint, the rider with the best poker hand is the winner. Typically poker runs end with a party, and the proceeds benefit a charity.

Wikipedia
Poker run

A poker run is an organized event where participants, usually using motorcycles, all-terrain vehicles, boats, snowmobiles, horses, on foot or other means of transportation must visit five to seven checkpoints, drawing a playing card at each one. The object is to have the best poker hand at the end of the run. The event has a time limit, however the participants are not timed—winning is purely a matter of chance.

According to the Guinness Book of World Records, the record for the largest event was set in 2009 with 2,136 motorcyclists benefiting the Fallen Firefighter Survivors Foundation (FFSF).

The record for the largest single venue event was set in 2012, with 586 motorcyclists raising money for Prostate Cancer research in Ottawa, Canada.