Personally Im enjoying the War Thunder Halloween event. Its just races with weapons disabled, but its silly fun.
Deadlock made the breakable pots into pumpkins and put masks on the characters
Splatoon 3 had the Splatoween Fest over the weekend. Same as last year’s event, just a typical Splatfest but with some spooky aesthetics added.
Dead by Daylight added mystical smoke grenades survivors can use that are a lot of fun - many are suggesting it might become an ability as part of the main game.
No Man’s Sky has their Cursed Expedition happening now.
Pokemon S/V has a ghost type outbreak, along with Gengar raids.
I think Diablo IV is doing something too, but I have been playing NMS, Pokemon, and planning for IRL Halloween.
A lot of games in roblox ;-)
I’d say Halo should have a Haloween event.