The location is not mandatory for an event

gestion/migrations/0004_event_location_not_mandatory.py

@@ -0,0 +1,26 @@
+# -*- coding: utf-8 -*-
+# Generated by Django 1.11b1 on 2017-08-07 19:49
+from __future__ import unicode_literals
+
+from django.db import migrations, models
+import django.db.models.deletion
+
+
+class Migration(migrations.Migration):
+
+    dependencies = [
+        ('gestion', '0003_association_and_events'),
+    ]
+
+    operations = [
+        migrations.AlterField(
+            model_name='event',
+            name='location',
+            field=models.ForeignKey(
+                blank=True, null=True,
+                on_delete=django.db.models.deletion.PROTECT,
+                to='gestion.Location',
+                verbose_name='lieux'
+            ),
+        ),
+    ]

gestion/models.py

@@ -179,6 +179,7 @@ class Event(models.Model):
     title = models.CharField(_("titre"), max_length=200)
     location = models.ForeignKey(
         Location,
+        blank=True, null=True,
         on_delete=models.PROTECT,
         verbose_name=_("lieux"),
     )