You can gold all events* on a certain section (Note: Every section has 9 races) in either A-Spec or B-Spec (e.g. Golding every Endurance event will get you a level 24 ticket). You can also do the Expert Seasonals that will get you the level 21, level 22, and level 23 tickets when golded.
* For the championships, I think you only have to gold the Championship option instead of golding the individual races.