Update Summary.js to run setValue with the tag field.

static/plugin_event/src/form/field/Summary.js

@@ -62,7 +62,27 @@ Ext.define("Event.form.field.Summary", {
 
         // instantiate the base class
         me.callParent(arguments);
-    }
+    },
 
     // jshint strict: true
+
+    // supersede the based-class to deal with Ext.form.field.Tag
+    setValue: function (value) {
+
+        "use strict";
+
+        var me = this,
+            source = value || me.originalValue;
+
+        if(Ext.isArray(source.functions)) {
+            value.functions = source.functions.toString();
+        }
+
+        me.grid.setSource(source);
+
+        // the standard way to set the value for a field
+        // extract from Ext.form.field.Base
+        return me.mixins.field.setValue.call(me, source);
+    }
+
 });
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