gistfile1.txt

{
   "@context": {
      "@vocab": "http://schema.org/",
      "id": "@id",
      "ref": "@id",
      "type": "@type"
   },
   "@graph": [
   {
      "type": "http://schema.org/Event",
      "name": "Foo Fighters at Shoreline Amphetheatre",
      "description": "Main show: Foo Fighters. Opening band: Muse",
      "performers": [
          {
              "ref": "#band1"
          },
          {
              "ref": "#band2"
          }
      ]
    },
    {
        "type": "http://schema.org/PerformingGroup",
        "id": "#band1",
        "name": "Foo Fighters"
    },
    {
        "type": "http://schema.org/PerformingGroup",
        "id": "#band2",
        "name": "Muse"
    }
  ]
}