Unlock Clem by beating Harley's final event on the tour.
Unlock Donna by beating Summer's final event on the tour.

Unlock Harvest by beating Clem's final event on the tour.

Unlock Ice Ridge by beating Ice Trey's final event on the tour.

Unlock Killer Miller by beating Trixie's final event on the tour.

Unlock Trixie by beating Donna's final event on the tour.