I assume this is supposed to be referencing the geographical location schema?

peternewman · web-flow · commit fc4c2f5cb3b9 · 2019-08-23T00:03:13.000+01:00
diff --git a/learn/examples/calendar.schema.json b/learn/examples/calendar.schema.json
@@ -41,7 +41,7 @@
       "type": "string"
     },
     "geo": {
-      "$ref": "http://example.com/geo.schema.json"
+      "$ref": "http://example.com/geographical-location.schema.json"
     }
   }
 }

Original file line number	Diff line number	Diff line change
`@@ -41,7 +41,7 @@`
`41`	`41`	`"type": "string"`
`42`	`42`	`},`
`43`	`43`	`"geo": {`
`44`		`- "$ref": "http://example.com/geo.schema.json"`
	`44`	`+ "$ref": "http://example.com/geographical-location.schema.json"`
`45`	`45`	`}`
`46`	`46`	`}`
`47`	`47`	`}`