What: Three open-wheel racecars will rumble through the streets of San Francisco at historic Ghirardelli Square for the Chocolate Mini-Grand Prix.

When: Wednesday, Aug. 24, 11:30 a.m. (Pacific)

Who: IRL IndyCar Series drivers Danica Patrick and Buddy Rice will pilot their Argent Mortgage/Pioneer cars, and another driver will pilot a Menards Infiniti Pro Series car.

Where: The Chocolate Mini-Grand Prix will begin at the corner of Beach and Larkin streets at Ghirardelli Square, near Fisherman’s Wharf, San Francisco.

Why: The event is being held as a promotion for the upcoming Argent Mortgage Indy Grand Prix at Infineon Raceway, Aug. 26-28. This will mark the first event on a permanent road course in the 10-year history of the IRL. The “winner” of the Chocolate Mini-Grand Prix will be rewarded with a 10-pound chocolate bar from world-famous Ghirardelli Chocolates.