Take the Worlds level and reverse engineer it.
Attendance:
Worlds: Pros and Experts. No Novice or Rookies.
Nationals: Pros, Experts and Novice. No Rookies.
Regionals: Pros, Experts, Novice and Rookies.
State/local: Pros, Experts, Novice and Rookies.
Champions:
Worlds: Pros only. (You can not be a “World Champion” in the Expert/Challenge class. You are just the winner of the world challenge race)
Nationals: Pros and Experts
Regionals: Pros, Experts and Novice
State: Pros, Experts, Novice and Rookies.