Event - How to unlock
Ice Water - Place 2nd or better in standings in Volcano Void.
Infinity Circuit - Place 1st in standings in Ice Water.
Null Prime - Place 3rd or better in standings in Wet Wasteland.
Primus Dominus - Place 1st in standings in Inifinity Circuit.
Volcano Void - Place 2nd or better in standings in Null Prime.
Wet Wasteland - Place 3rd or better in standings in Beginner's Luck.