Haven't really played many of these seasonal events, but yesterday I decided to have a go at this. Open the garage through the event to get it filtered to see if I had any cars that were currently usable. Had a Dome Zero Concept with 398PP and gave it a go.
I am far from an expert so I didn't expect to do too well. Started out getting around 6th to 8th place finishes on each race. But just kept at it and improved slowly but steadily on each run. The little things like finding the perfect sweet speed through corners, and getting better and better sweet spots for breaking (i.e. a shadow on the track, or the distance markers before the hairpin-y turns) helps alot.
Slight improvements on each new run, and after 2-3 runs on each track I was able to get consistent lap times low enough to get up to first place right around the end of fourth lap on most tracks. All in all, I found that I didn't have to drive perfect, I just had to weed out the big screw ups. (And mind you, this was with no diddling with the transmission, or any other setup adjustments done to the car beforehand.)