Newsweek called Dayton's the swingingest spot in Minneapolis, and almost anyone living in the Twin Cities during the twentieth century has an anecdote to prove it. At Dayton's, you could buy a cashmere sweater for a song during an Anniversary Sale or commission a Persian silk dress for a society wedding. You could attend an eighth-floor extravaganza like Santabear's First Christmas or catch the occasional circus. Dayton's was the job that put many...