diff --git a/src/Controller/Webhook/MailjetNewsletterWebhookController.php b/src/Controller/Webhook/MailjetNewsletterWebhookController.php
index 1adc8d3..9bebce8 100644
--- a/src/Controller/Webhook/MailjetNewsletterWebhookController.php
+++ b/src/Controller/Webhook/MailjetNewsletterWebhookController.php
@@ -163,7 +163,12 @@ final class MailjetNewsletterWebhookController extends AbstractController
         if (true === is_string($value) && '' !== trim($value)) {
             try {
                 return new \DateTimeImmutable($value);
-            } catch (\Throwable) {
+            } catch (\Throwable $e) {
+                $this->logger->debug('Could not parse event timestamp from Mailjet webhook payload', [
+                    'value' => $value,
+                    'error' => $e->getMessage(),
+                ]);
+
                 return null;
             }
         }
diff --git a/src/Form/Service/ParticipantDateOfBirthFieldHandler.php b/src/Form/Service/ParticipantDateOfBirthFieldHandler.php
index bcff63b..cc84c16 100644
--- a/src/Form/Service/ParticipantDateOfBirthFieldHandler.php
+++ b/src/Form/Service/ParticipantDateOfBirthFieldHandler.php
@@ -6,6 +6,7 @@ namespace App\Form\Service;
 
 use App\Form\Model\BookingDto;
 use App\Form\Service\Abstract\AbstractParticipantFieldHandler;
+use Psr\Log\LoggerInterface;
 
 /**
  * Handles processing of the dateOfBirth field for booking participants.
@@ -21,10 +22,14 @@ use App\Form\Service\Abstract\AbstractParticipantFieldHandler;
  * - Handles empty selections (converting them to null)
  * - Updates the participant's dateOfBirth property
  *
- * Dependencies: None (this is a base field that other handlers may depend on)
+ * Dependencies: Other handlers may depend on this field being processed first (age-based visibility).
  */
 class ParticipantDateOfBirthFieldHandler extends AbstractParticipantFieldHandler
 {
+    public function __construct(private readonly LoggerInterface $logger)
+    {
+    }
+
     /**
      * Returns the form field name this handler processes.
      *
@@ -118,7 +123,11 @@ class ParticipantDateOfBirthFieldHandler extends AbstractParticipantFieldHandler
 
                 return new \DateTimeImmutable($dateString);
             } catch (\Exception $e) {
-                // Invalid date components (e.g., Feb 31, invalid year)
+                $this->logger->debug('Invalid date of birth components submitted', [
+                    'date_string' => $dateString,
+                    'error' => $e->getMessage(),
+                ]);
+
                 return null;
             }
         }
@@ -138,7 +147,10 @@ class ParticipantDateOfBirthFieldHandler extends AbstractParticipantFieldHandler
             try {
                 return new \DateTimeImmutable($value);
             } catch (\Exception $e) {
-                // Invalid date format, return null
+                $this->logger->debug('Invalid date of birth string submitted', [
+                    'error' => $e->getMessage(),
+                ]);
+
                 return null;
             }
         }