An entire comment about my thoughts on this.
First of all, PVP won't do well in Regalia, it would get annoying and stop people from roleplaying for some time, which means the server won't provide any real entertainment to some people, like it is supposed to, however I feel that RP crime being legal for 12 hours in IRL time would make this idea come to life. Also, if you think about it, what would be the reason for this happening in Regalia, here is the real reason for the purge in the movie.
"In 2014, "The New
Founding Fathers of America" have been voted into office following economic collapse, and eventually sanction an annual national civic tradition called "The Purge", the first of which takes place in 2017. The Purge occurs for 12 hours, March 21ā22 7 p.m. ā 7 a.m., the next day, during which all crime is legal and all police, fire, and medical emergency services remain unavailable. Restrictions prohibit government officials "ranking 10" from being disturbed, as well as the use of all weapons above Class 4" -Wikipedia
Here is the original Wikipedia thread:
https://en.wikipedia.org/wiki/The_Purge
There isn't any way I could think of that a purge could happen in Regalia, and why it would happen. I don't have any other thoughts on this, those were the two big ones. (Although I think it would be such a cool roleplay experience to have, especially if everyone participates.)