Evo is the biggest fighting game tournament in the world and is a big deal no matter how you slice it.
To commemorate the event, Steam, has organized a sale which covers basically every fighting game. From some of the biggest ones like Street Fighter 6, Tekken 8, Mortal Kombat 1, Guilty Gear -STRIVE-, to smaller games like Rivals of Aether, Samurai Shodown, and The King of Fighters XV.
Interestingly, Killer Instinct is free to play.
You can access the page here.
Unfortunately, hugely popular items like Street Fighter 6 DLC is not part of the sale, and this has made some a little less enthused with the offering.