24 Hours of Quezon
From Halopedia, the Halo wiki
24 Hours of Quezon was a motorsport event hosted in the city of Quezon on the human Inner Colony of Reach. AMG Transport Dynamics' prototypes and "RallyHog" models have won class victories in the event.[1] 24 Hours of Quezon was one of the events that was a part of humanity's high-stakes interstellar motorsports league, along with the New Carthage Sprint Series.[2]
The event was likely suspended indefinitely when Reach was glassed by the Covenant in the summer of 2552.