Every year for the holiday season Lego releases an Advent calendar full of mini-builds and Minifigures.
There used to only be one and it was a generic City type set. But the past few years they included Star Wars and Lego Friends too. Here is a sneak peek of the 3 advent calendars coming out this year.
Classic Lego City.
Lego Star Wars.
The sets are typically available September 1st on Lego.com, Lego Stores, ToysRUs & Target and they do sell out fast so I suggest marking your calendars!