Rewards: 71 Gold, M$71,000
Location: NASCAR
Unlocks from: Owning a 2023 Season NASCAR Stock Car
Maximum Required PR: 63.8

No car-specific events, so only one car is actually necessary to complete the series, but it will need to be almost fully upgraded to do that.
There are 40 events - 30 Trophy + 10 TT - shared across ten tracks, with each track hosting three Trophy events and a TT.  You need to complete 2 Trophy events on a track before its TT will open, and all 3 Trophy events before the next track will open up.

Progress Rewards split:
25% - 9GC and M$9,000         [PR 50.8]
50% - 14GC and M$14,000      [PR 55.6]
75% - 19GC and M$19,000      [PR 60.1]
100% - 29GC and M$29,000