Leaked upcoming @steam_games 2019 sale dates:

🎃 Halloween Sale: October 28 - November 1
🍂 Autumn Sale: November 26 - December 3
🎅 Winter Sale: December 19 - January 2

Multiple developers posted it in multiple places despite Valve asking otherwise. But you know how that goes.

— Steam Database (@SteamDB) October 19, 2019