Multiple developers are now confirming that the Steam Autumn Sale is slated to run from November 21 to November 27.
Joystiq is reporting that Tamás Bakó, CEO of Artery Studios, is claiming that Valve contacted him about putting Secrets of the Magic Crystals on sale, revealing the dates that it would take place.
The Winter Sale dates were also revealed: a mere month later, from December 20 to January 4. Gentlemen, start your wallets.
Source: Joystiq (Thanks, Spkypwnsuall)