St. Louis Sign: Construction Career Day?

[
      {
        "name": "Ad - NativeInline - Injected",
        "component": "37365813",
        "insertPoint": "3",
        "requiredCountToDisplay": "5"
      },{
        "name": "Real 1 Player (r2) - Inline",
        "component": "37365812",
        "insertPoint": "2/3",
        "requiredCountToDisplay": "9"
      }
    ]

Anyone have any ideas what this digital sign, which was seen flashing in two different places around the Pageant on Tuesday night, means? Alternately, this begs a "caption the picture" contest. Unreal can certainly think of a few...

-- Unreal