About a mile south from U.S. Bank Stadium, in a midtown Minneapolis building-turned-market called Mercado Central, the only visible reminder that a big sports game is happening in the city this weekend is a sign of protest. On a message board dressed with community announcements and plumber suggestions, a pink sheet of paper with a picture of Colin Kaepernick and Eric Reid kneeling invites passerby to an anti-racist, anti-corporate rally. It is scheduled to start two and a half hours before Super Bowl XLII. Mercado’s message board | David Roth Sports flyer | David Roth A few steps away, a display lights a wall of strawberry, vanilla, and chocolate conchas. The case of baked goods faces what is an almost life-sized nativity scene, even though it’s already February. Conchas in the Me…