Voici la date des futures soldes steam Haloween, Automne et Noël :
Steam Database @SteamDB
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.