This is a holiday you can celebrate whenever you want and allows you to commit violent acts against furries for the crimes against humanity they have committed.
Person 1: Bro, why are you beating that furry up?
Person 2: I'm partaking in Anti-Furry Day.
Person 1: Seems fair, I'll join.
I hate furries and will commit furry genocide, for I shall decide that every day is Anti-Furry Day from today onward.
Anti-Furry day is a Anti-Furry party on 31st May in which you can: ruin, raid any furry hangouts and roleplays, also beat them and Jesus will help you!
A: hey, it's 31st May, you know what to do?
B: yes, let's go beat some furries and raid their hangouts, because it's Anti-Furry Day!