diff --git a/.schemas/category.json b/.schemas/category.json
index 0e80684134..3e327212ae 100644
--- a/.schemas/category.json
+++ b/.schemas/category.json
@@ -13,6 +13,20 @@
     "title":{
       "description":"Title of event where videos originated",
       "type":"string"
+    },
+    "url":{
+      "description":"Canonical URL to the event website",
+      "type":"string"
+    },
+    "start_date":{
+      "description":"Start date of the event in YYYY-MM-DD format",
+      "type":"string",
+      "format":"date"
+    },
+    "end_date":{
+      "description":"End date of the event in YYYY-MM-DD format",
+      "type":"string",
+      "format":"date"
     }
   },
   "required":[
diff --git a/djangocon-eu-2010/category.json b/djangocon-eu-2010/category.json
index eb59793fb7..ca24b649b4 100644
--- a/djangocon-eu-2010/category.json
+++ b/djangocon-eu-2010/category.json
@@ -1,6 +1,7 @@
 {
   "description": "",
-  "start_date": null,
+  "start_date": "2010-05-24",
+  "end_date": "2010-05-26",
   "title": "DjangoCon Europe 2010",
   "url": ""
 }
diff --git a/pygotham-2012/category.json b/pygotham-2012/category.json
index 60afe456cf..968885add1 100644
--- a/pygotham-2012/category.json
+++ b/pygotham-2012/category.json
@@ -1,6 +1,7 @@
 {
   "description": "",
-  "start_date": null,
+  "start_date": "2012-06-08",
+  "end_date": "2012-06-08",
   "title": "PyGotham 2012",
   "url": ""
 }