This is the bulk of all the mission challenges events as you will need to secure gold in a total of 32 races, for each race you will be driving a different car around a different circuit/circuit layout so your best strategy is to drive each race to learn the car and circuit then when your familiar you can then go for the gold, the 32 events are as follows
1-2, 1-5, 1-8, 2-1, 2-3, 2-5, 2-8, 3-1, 3-3, 3-4, 3-6, 3-7, 4-1, 4-6, 4-7, 4-8, 5-3, 5-6, 5-7, 5-8, 6-2, 6-4, 6-6, 6-7, 6-8, 8-1, 8-2, 8-3, 8-5, 8-6, 8-7, 8-8
Once you have won all races your Trophy will unlock