diff --git a/modules/recurring_events_registration/recurring_events_registration.module b/modules/recurring_events_registration/recurring_events_registration.module
index 1927c939aaeed8f444f951eb7b357d2c0af6ff90..9a3da95c216414eccf36c68e7264d47045c146f3 100644
--- a/modules/recurring_events_registration/recurring_events_registration.module
+++ b/modules/recurring_events_registration/recurring_events_registration.module
@@ -6,6 +6,8 @@
  */
 
 use Drupal\Core\Routing\RouteMatchInterface;
+use Drupal\Core\Entity\EntityTypeInterface;
+use Drupal\Core\Field\BaseFieldDefinition;
 
 /**
  * Implements hook_help().
@@ -22,3 +24,73 @@ function recurring_events_registration_help($route_name, RouteMatchInterface $ro
     default:
   }
 }
+
+/**
+ * Implements hook_entity_base_field_info_alter().
+ */
+function recurring_events_registration_entity_base_field_info_alter(&$fields, EntityTypeInterface $entity_type) {
+  if ($entity_type->id() === 'eventseries') {
+    // TODO Registration fields to all be one custom field.
+    $fields['registration'] = BaseFieldDefinition::create('boolean')
+      ->setLabel(t('Enable Registration'))
+      ->setDescription(t('Select whether to enable registration for this series.'))
+      ->setDisplayConfigurable('form', TRUE)
+      ->setDisplayConfigurable('view', TRUE)
+      ->setRevisionable(TRUE)
+      ->setCardinality(1)
+      ->setDisplayOptions('form', [
+        'type' => 'boolean_checkbox',
+        'settings' => [
+          'display_label' => TRUE,
+        ],
+        'weight' => 100,
+      ])
+      ->setDisplayOptions('view', [
+        'type' => 'hidden',
+      ]);
+
+    $fields['registration_type'] = BaseFieldDefinition::create('list_string')
+      ->setLabel(t('Registration Type'))
+      ->setDescription(t('Select which type of registration applies to this event.'))
+      ->setDisplayConfigurable('form', TRUE)
+      ->setDisplayConfigurable('view', TRUE)
+      ->setRevisionable(TRUE)
+      ->setCardinality(1)
+      ->setSetting('allowed_values', [
+        'instance' => t('Individual Event Registration'),
+        'series' => t('Entire Series Registration'),
+      ])
+      ->setDisplayOptions('form', [
+        'type' => 'options_buttons',
+        'settings' => [
+          'allowed_values' => [
+            'instance' => t('Individual Event Registration'),
+            'series' => t('Entire Series Registration'),
+          ],
+        ],
+        'weight' => 101,
+      ]);
+
+    $fields['registration_dates'] = BaseFieldDefinition::create('list_string')
+      ->setLabel(t('Registration Dates'))
+      ->setDescription(t('Select whether to enable open or scheduled registration'))
+      ->setDisplayConfigurable('form', TRUE)
+      ->setDisplayConfigurable('view', TRUE)
+      ->setRevisionable(TRUE)
+      ->setCardinality(1)
+      ->setSetting('allowed_values', [
+        'open' => t('Open Registration'),
+        'scheduled' => t('Scheduled Registration'),
+      ])
+      ->setDisplayOptions('form', [
+        'type' => 'options_buttons',
+        'settings' => [
+          'allowed_values' => [
+            'open' => t('Open Registration'),
+            'scheduled' => t('Scheduled Registration'),
+          ],
+        ],
+        'weight' => 102,
+      ]);
+  }
+}
diff --git a/src/Entity/EventSeries.php b/src/Entity/EventSeries.php
index b7e722e27fd68f3062976fd4d27cc049ee8dd445..bffe20a85a00664dbb25ac3afa507dfb8f863c5f 100644
--- a/src/Entity/EventSeries.php
+++ b/src/Entity/EventSeries.php
@@ -381,7 +381,7 @@ class EventSeries extends EditorialContentEntityBase implements EventInterface {
       ->setDisplayOptions('view', [
         'label' => 'above',
         'weight' => 10,
-      ]);;
+      ]);
 
     $fields['weekly_recurring_date'] = BaseFieldDefinition::create('weekly_recurring_date')
       ->setLabel(t('Weekly Recurring Date'))
diff --git a/src/Form/EventInstanceSettingsForm.php b/src/Form/EventInstanceSettingsForm.php
index 4ddbb89a1c67cee071bd4a7bac2d06a4dd78c304..85130ea61dd7d7a4f4bd23ff4874203492a8b5d4 100644
--- a/src/Form/EventInstanceSettingsForm.php
+++ b/src/Form/EventInstanceSettingsForm.php
@@ -2,7 +2,7 @@
 
 namespace Drupal\recurring_events\Form;
 
-use Drupal\Core\Form\ConfigFormBase;;
+use Drupal\Core\Form\ConfigFormBase;
 use Drupal\Core\Form\FormStateInterface;
 use Drupal\Core\Url;
 use Drupal\Core\Link;
diff --git a/src/Form/EventSeriesSettingsForm.php b/src/Form/EventSeriesSettingsForm.php
index 1379d80b38aa14414412470dd2ec1d1da0fbc9db..b81b02e6b425f23133944871c1c2390f25611c4b 100644
--- a/src/Form/EventSeriesSettingsForm.php
+++ b/src/Form/EventSeriesSettingsForm.php
@@ -2,7 +2,7 @@
 
 namespace Drupal\recurring_events\Form;
 
-use Drupal\Core\Form\ConfigFormBase;;
+use Drupal\Core\Form\ConfigFormBase;
 use Drupal\Core\Form\FormStateInterface;
 use Drupal\Core\Url;
 use Drupal\Core\Link;