I find porn parodies to be self-defeating, in that generally (with both eyes riveted to the cash register) they are ripoffs rather than parody -using some popular movie or TV show for nostalgia and adding explicit sex to a stolen script. This 4-part Brazzers feature is an exception in that it takes the gimmick (not the story) of that execrable paen to violence movie series The Purge, and converts it to sex -a vast improvement. Of course, since it's from Brazzers it's gonzo rather than story-oriented.
So a voice-over invokes the premise: a dystopia where one day a year everyone has unlimited sex -no questions asked (e.g., dispensing with the issue of consent). And this being porn it is not a license to glorify rape but merely the usual ladies loving having group sex, whether in a gang-bang format or lesbian.
The finale is out on a sports field where a large number of young girls in knee socks have an instant orgy with studs. Opening scene has Euro star Cassie Del Isla going airtight with three famous porn actors. For a gang bang, Angel Youngs, oddly wearing glasses (perhaps for that odd fetish of "cum shot on the glasses" climax) is quite appealing. And in perhaps the best scene the girls on yoga mats turn to sex when the Day of Debauchery begins at its appointed time, with Kira Noir and Kayley Gunner dominating Gizelle Blanco.
I don't know what the pay scale for porn performers is nowadays, but Brazzers' international conglomerate parent company Aylo (fka MindGeek) apparently spent lots of money on this ephemeral content in an era of drastically reduced budgets by hiring over 30 performers where half a dozen per feature is more the norm.