The Heroes' Pursuits: Fyresdal
Side quest
Skellige 
On the world map
From the journal
The glory of Modron Freya knows no bounds and in Skellige everyone pays their resects to this goddess. In Fyresdal and many other, similar locales, the Great Mother was honored by holding horse races. Geralt decided to take part.
Skelligers make fine riders, but Geralt is no spring chicken himself when it comes to horse racing. Thanks to his well-honed skills, Roach's effort and the goddess' favor, the witcher triumphed.