diff --git a/mpicms/events/migrations/0015_event_external.py b/mpicms/events/migrations/0015_event_external.py
new file mode 100644
index 0000000..c1bbe40
--- /dev/null
+++ b/mpicms/events/migrations/0015_event_external.py
@@ -0,0 +1,18 @@
+# Generated by Django 3.1.7 on 2021-03-21 11:49
+
+from django.db import migrations, models
+
+
+class Migration(migrations.Migration):
+
+    dependencies = [
+        ('events', '0014_auto_20210114_1926'),
+    ]
+
+    operations = [
+        migrations.AddField(
+            model_name='event',
+            name='external',
+            field=models.BooleanField(default=False),
+        ),
+    ]
diff --git a/mpicms/events/models.py b/mpicms/events/models.py
index d6addf1..2d48e2a 100644
--- a/mpicms/events/models.py
+++ b/mpicms/events/models.py
@@ -20,6 +20,7 @@ class Event(BodyMixin, BasePage):
     start_time = models.TimeField(_('start time'), blank=True, null=True)
     end_time = models.TimeField(_('end time'), blank=True, null=True)
     room = models.CharField(_('Room'), max_length=10, blank=True)
+    external = models.BooleanField(default=False)
 
     header_image = models.ForeignKey(
         'wagtailimages.Image',
@@ -36,6 +37,7 @@ class Event(BodyMixin, BasePage):
         ImageChooserPanel('header_image'),
         MultiFieldPanel(
             [
+                FieldPanel('external'),
                 FieldPanel('start_date'),
                 FieldPanel('start_time'),
                 FieldPanel('end_date'),
@@ -74,7 +76,7 @@ def get_dict(self, request=None):
             'start': self.start.isoformat(),
             'end': self.end.isoformat() if self.end else None,
             'url': self.get_url(request=request),
-            'color': '#006c66'
+            'color': '#aa0000' if self.external else '#006c66'
         }
 
     def clean(self):