Woops forgot the migration.

src/program/migrations/0072_auto_20190616_1746.py

@@ -0,0 +1,18 @@
+# Generated by Django 2.2.2 on 2019-06-16 15:46
+
+from django.db import migrations, models
+
+
+class Migration(migrations.Migration):
+
+    dependencies = [
+        ('program', '0071_auto_20180827_1958'),
+    ]
+
+    operations = [
+        migrations.AlterField(
+            model_name='speakerproposal',
+            name='email',
+            field=models.EmailField(help_text='The email of the speaker (defaults to the logged in user if empty).', max_length=150),
+        ),
+    ]