diff --git a/src/reducers/schema/eventSchema.js b/src/reducers/schema/eventSchema.js
index ae308e0..fb42cf5 100644
--- a/src/reducers/schema/eventSchema.js
+++ b/src/reducers/schema/eventSchema.js
@@ -3,22 +3,25 @@ import Joi from 'joi';
 const eventSchema = Joi.object().keys({
     id:               Joi.string().required(),
     description:      Joi.string().allow('').required(),
-    date:             Joi.string().required(),
-    time:             Joi.string().required(),
+    date:             Joi.string().allow(''),
+    time:             Joi.string().allow(''),
     time_precision:   Joi.string().allow(''),
-    location:         Joi.string().allow('').required(),
-    latitude:         Joi.string().allow('').required(),
-    longitude:        Joi.string().allow('').required(),
+    location:         Joi.string().allow(''),
+    latitude:         Joi.string().allow(''),
+    longitude:        Joi.string().allow(''),
     type:             Joi.string().allow(''),
     category:         Joi.string().required(),
     narratives:       Joi.array(),
     sources:          Joi.array(),
     tags:             Joi.array().allow(''),
     comments:         Joi.string().allow(''),
-    timestamp:        Joi.string().required(),
+    timestamp:        Joi.string(),
 
     // nested
     narrative___stepStyles: Joi.array(),
-});
+})
+  .and('latitude', 'longitude')
+  .and('date', 'time', 'timestamp')
+  .or('timestamp', 'latitude')
 
-export default eventSchema;
+export default eventSchema