diff --git a/addons/event/models/event_registration.py b/addons/event/models/event_registration.py
index 73e229a1265..b258ab6973e 100644
--- a/addons/event/models/event_registration.py
+++ b/addons/event/models/event_registration.py
@@ -86,6 +86,18 @@ class EventRegistration(models.Model):
         registrations_confirmed.event_id._check_seats_availability()
         registrations_confirmed.event_ticket_id._check_seats_availability()
 
+    def default_get(self, fields):
+        ret_vals = super().default_get(fields)
+        utm_mixin_fields = ("campaign_id", "medium_id", "source_id")
+        utm_fields = ("utm_campaign_id", "utm_medium_id", "utm_source_id")
+        if not any(field in utm_fields for field in fields):
+            return ret_vals
+        utm_mixin_defaults = self.env['utm.mixin'].default_get(utm_mixin_fields)
+        for (mixin_field, field) in zip(utm_mixin_fields, utm_fields):
+            if field in fields and utm_mixin_defaults.get(mixin_field):
+                ret_vals[field] = utm_mixin_defaults[mixin_field]
+        return ret_vals
+
     @api.depends('partner_id')
     def _compute_name(self):
         for registration in self:
diff --git a/addons/website_event/tests/test_website_event.py b/addons/website_event/tests/test_website_event.py
index 6513a2892d9..d646531fbd3 100644
--- a/addons/website_event/tests/test_website_event.py
+++ b/addons/website_event/tests/test_website_event.py
@@ -4,16 +4,54 @@
 from datetime import datetime, timedelta
 from dateutil.relativedelta import relativedelta
 
-from odoo import fields
+from odoo import fields, http
 from odoo.addons.base.tests.common import HttpCaseWithUserDemo, HttpCaseWithUserPortal
 from odoo.addons.mail.tests.common import mail_new_test_user
 from odoo.addons.website.tests.test_base_url import TestUrlCommon
-from odoo.addons.website_event.tests.common import OnlineEventCase
+from odoo.addons.website_event.tests.common import TestEventOnlineCommon, OnlineEventCase
 from odoo.exceptions import AccessError
-from odoo.tests import tagged
+from odoo.tests import HttpCase, tagged
 from odoo.tools import mute_logger
 from odoo.tests.common import users
 
+class TestEventRegisterUTM(HttpCase, TestEventOnlineCommon):
+    def test_event_registration_utm_values(self):
+        self.event_0.registration_ids.unlink()
+        self.event_0.write({
+            'event_ticket_ids': [
+                (5, 0),
+                (0, 0, {
+                    'name': 'First Ticket',
+                }),
+            ],
+            'is_published': True
+        })
+        event_campaign = self.env['utm.campaign'].create({'name': 'utm event test'})
+
+        self.authenticate(None, None)
+        self.opener.cookies.update({
+            'odoo_utm_campaign': event_campaign.name,
+            'odoo_utm_source': self.env.ref('utm.utm_source_newsletter').name,
+            'odoo_utm_medium': self.env.ref('utm.utm_medium_email').name
+        })
+        event_questions = self.event_0.question_ids
+        name_question = event_questions.filtered(lambda q: q.question_type == 'name')
+        email_question = event_questions.filtered(lambda q: q.question_type == 'email')
+        self.assertTrue(name_question and email_question)
+        # get 1 free ticket
+        self.url_open(f'/event/{self.event_0.id}/registration/confirm', data={
+            f'1-name-{name_question.id}': 'Bob',
+            f'1-email-{email_question.id}': 'bob@test.lan',
+            '1-event_ticket_id': self.event_0.event_ticket_ids[0].id,
+            'csrf_token': http.Request.csrf_token(self),
+        })
+        new_registration = self.event_0.registration_ids
+        self.assertEqual(len(new_registration), 1)
+        self.assertEqual(new_registration.utm_campaign_id, event_campaign)
+        self.assertEqual(new_registration.utm_source_id, self.env.ref('utm.utm_source_newsletter'))
+        self.assertEqual(new_registration.utm_medium_id, self.env.ref('utm.utm_medium_email'))
+
+
 @tagged('post_install', '-at_install')
 class TestUi(HttpCaseWithUserDemo, HttpCaseWithUserPortal):