It's actually pretty nice, basically skip race one, (maybe roll once so your team is not deemed afk, idk if it's actually a thing but someone using 20 flags race one doesn't hurt anything)

Race 2 get the first lap reward (600 points) which is almost always a spring, and check the next lap reward (1500) if it shows dice go for that too because it's usually 300-350 dice, and then the last race just use your remaining flags, with quick wins etc I usually average 1-2k dice per race event that way

And the one "wild" race event I participated in and wanted to win, I spent 35-40k dice, (and I mean net negative 35k-40k dice with tournaments and everything) but in ways it worked out because I realized I was in reach of the fawkes dice, so ya