Some notes about Steam's two major seasonal promotions for 2014.
The Steam Summer Sale 2014 was a Steam event. It featured a Steam Trading Cards system, which could be collected to craft badges and earn rewards. In addition to standard Steam community rewards (emoticons, profile backgrounds, etc)...
If you're wondering when the Steam Winter sale dates is this year, it looks like those dates might've been leaked, as these things usually are. Kotaku reported that a developer source had shared the dates for both the Steam Winter and Autumn sales...