diff --git a/countdown/migrations/0006_auto_20201025_1716.py b/countdown/migrations/0006_auto_20201025_1716.py
new file mode 100644
index 0000000..72a2fc3
--- /dev/null
+++ b/countdown/migrations/0006_auto_20201025_1716.py
@@ -0,0 +1,23 @@
+# Generated by Django 3.1.2 on 2020-10-25 17:16
+
+from django.db import migrations, models
+
+
+class Migration(migrations.Migration):
+
+    dependencies = [
+        ('countdown', '0005_countdownitem_recurring_until'),
+    ]
+
+    operations = [
+        migrations.AlterField(
+            model_name='countdownitem',
+            name='recurring_period',
+            field=models.CharField(blank=True, default='', max_length=64),
+        ),
+        migrations.AlterField(
+            model_name='countdownitem',
+            name='reminder_target',
+            field=models.CharField(blank=True, default='', max_length=64),
+        ),
+    ]
diff --git a/countdown/models.py b/countdown/models.py
index fc2c89c..6a84fc3 100644
--- a/countdown/models.py
+++ b/countdown/models.py
@@ -1,14 +1,8 @@
 """Countdown item models."""
-
-import logging
-
 from django.db import models
 from django.utils import timezone
 
 
-log = logging.getLogger('countdown.models')
-
-
 class CountdownItem(models.Model):
     """Track points in time."""
 
@@ -19,13 +13,13 @@ class CountdownItem(models.Model):
     sent_reminder = models.BooleanField(default=False)
 
     reminder_message = models.TextField(default="")
-    reminder_target = models.CharField(max_length=64, default='')
+    reminder_target = models.CharField(max_length=64, blank=True, default='')
 
-    recurring_period = models.CharField(max_length=64, default='')
+    recurring_period = models.CharField(max_length=64, blank=True, default='')
     recurring_until = models.DateTimeField(null=True, blank=True, default=None)
 
     created_time = models.DateTimeField(auto_now_add=True)
 
     def __str__(self):
-        """String representation."""
+        """Summarize object."""
         return "{0:s} @ {1:s}".format(self.name, timezone.localtime(self.at_time).strftime('%Y-%m-%d %H:%M:%S %Z'))