IT?S BACK. The only time of year that matters?the Portland Mercury?s Burger Week?is finally here! From Monday, August 13-Saturday August 18, at 50 of Portland?s most beloved restaurants, bars, and brew houses, you?ll find fantastic, one-of-a-kind burgers that exist ONLY for the Mercury?s Burger Week! That?d be great on it?s own, but it gets better: Each of those fantastic, one-of-a-kind burgers is only $5! The Portland Mercury?s Burger Week is brought to you by the…