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This is seriously the scariest thing ever... I live a little too close for comfort to the area and have plenty of friends in Louisville. SaviorShot (not sure if he is still around) is also located in the area.
Just as a basis so you don't have to read through the whole thing and other sources...
Some doof decided to make a flier of "The Louisville Purge" starting at the time I am posting this, tonight. It was posted on Twitter by said doof, and it spread like crazy. Fliers were made and found on the streets, if I read something correctly. The school system there, Jefferson County Public Schools (JCPS) has been on heightened alert and many activities, for public and private schools, have been postponed. The Jefferson County Police, Jeffersonville, Indiana Police, FBI, and plenty of other people are on alert. There is a Katy Perry concert at the Yum! Center as well as the Kentucky State Fair, both which have been named in rumors/threats.
Even if this was posted as a joke, this could be a catalyst for whack-jobs in the area for mass "flash-mob violence", some of which has started springing randomly throughout Kentucky since a March 22 attack. The city I am located in has also been named in threats and more crime has sprung up here in the past month or two.
I hope that this doesn't come to be... But be cautioned, everyone, throughout the weekend.