Imagine a TV series with the same premise, but just showing the bfore AND after of the purge. It's sort of a mystery why are people doing this, preparing so heavily to just other normal people that would go boinkers in a lawless society, and then the aftermath of all that with people going on with their days like it's nothing, with a creepy undertone of "just yesterday ya'll fuckers wanted to kill me".
And the final chapter is the day of the purge, when all goes down and crazy stuff happens. Stealing, rioting, hacking, financial fraud, maybe even a fucking foreign invasion!
Now that would be awesome.