Valve is changing the formula for two upcoming Steam Sales, dropping daily deals and flash deals. That's according to reports today from Shacknews and Eurogamer.Steam's annual fall sale will run November 25-December 1, while the winter promotion will be available December 22-January 4, according to Shacknews. This information is based on a note that Valve reportedly sent to Steam developers and publishers.Eurogamer has obtained this message, which explains why Valve is doing away with daily and flash deals."We'll still be highlighting your top games on the front page for 24-48 hour spans, but those products will stay at their most competitive discount, before and after being featured," Valve wrote.