Special events:
Meet the following goals to unlock the corresponding special feature:

Special 1 and 2
Successfully complete the Offroad course.

Special 3
Finish in first place in all Area 1 courses.

Special 4
Finish in first place in all Area 2 courses.

Special 5
Finish in first place in all Area 3 and 4 courses.

Bonus 4WD course:
Unlock more than 50 Choro-Q cars

Bonus Goldrash course:
Set a record in all Area 1, 2, and 3 courses between 22 hours to 23 hours.

Pro Shop:
Finish in first place in all Area 2 or 3 courses.

Special time to sell items in shop:
Visit the shop at 8 to 9 or 21 to 22 hours.