What's known as the Fiesta Cruiser Ride takes place Sunday at noon in Santa Barbara, Goleta and Isla Vista.
The event is un-permitted, but has still gained popularity in recent years with hundreds of participants.
The event takes place starting at Cabrillo Boulevard, going up State Street.
Santa Barbara Police and the Sheriff's Department say that they'll be enforcing the law along the way, for riders who do not follow the rules of the road.
Common infractions include riding on the wrong side of the road, running stop signs and failing to stop at red lights.
Some of the fines could be as high as $490.