Is it just me, or does a weekend that starts with a free festival seem somehow more auspicious than those weekends that don’t? (Even if you’re not a fan of this Friday’s Downtown After Five lineup, you can get your money’s worth—$0—in people-watching alone.) Beyond that, there’s free theater, a CD release and some of the area’s best-loved bands—including the reunion of Pure, on hiatus for the past 18 years. All for five bucks or less.