The chill is in the air. It's not too bad yet, but it's coming. So why not exercise both your brain and your civic duty -- while enjoying warm cookies and beer? That's just the start of the worthwhile activities in town this week -- many of them free, and three rating top-pick status. Check out our online Westword calendar for more listings, and if you know of other great free events, let us know about them in the comments section below.