Where everyone can do whatever they want, like in the actual Purge movie.
Just give us all the reins and kick back to watch the chaos. (Give us the power to make news posts, ban people {though they can unban themselves, let us change stuff and whatnot}
Then, they'll simply undo everything and that'd be it for the year (unless they allow another day)
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( ͡° ͜ʖ ͡°)