This is the unlock sequence from my notes (your mileage may vary):
Showcase
Lineup
First Car
License Plate
Radio Stations
PR Stunts
ANNA
Wheelspin
Bonus Boards
Expand Festival
Autoshow, Forzavista, Horns, Design/Tuning Import
Bucket List
Beauty Spots
Festival Site #2
Skill Shop
Loyalty Reward Cars
Convoy
Head-to-Head races
Skill Song
Festival/Radio Stations - Groove Music
Rivals
Street Races
Expand Site
Midnight Battle
Lineup/Fire Drivatar
Blueprint
Barn Find
Showcase #2
Expand Site
Barn Find
Championships
Festival Site #3
etc etc, Expand
Showcase #3
Car Meet