diff --git a/app/controllers/sac_cas/event/register_controller.rb b/app/controllers/sac_cas/event/register_controller.rb
new file mode 100644
index 000000000..81d9597d3
--- /dev/null
+++ b/app/controllers/sac_cas/event/register_controller.rb
@@ -0,0 +1,14 @@
+# frozen_string_literal: true
+
+#  Copyright (c) 2024, Schweizer Alpen-Club. This file is part of
+#  hitobito_sac_cas and licensed under the Affero General Public License version 3
+#  or later. See the COPYING file at the top-level directory or at
+#  https://github.com/hitobito/hitobito_sac_cas
+
+module SacCas::Event::RegisterController
+  def save_entry
+    if super
+      person.send_reset_password_instructions
+    end
+  end
+end
diff --git a/lib/hitobito_sac_cas/wagon.rb b/lib/hitobito_sac_cas/wagon.rb
index 769704587..3b75d6755 100644
--- a/lib/hitobito_sac_cas/wagon.rb
+++ b/lib/hitobito_sac_cas/wagon.rb
@@ -156,6 +156,7 @@ class Wagon < Rails::Engine
       Event::KindsController.prepend SacCas::Event::KindsController
       Event::KindCategoriesController.prepend SacCas::Event::KindCategoriesController
       Event::ParticipationsController.prepend SacCas::Event::ParticipationsController
+      Event::RegisterController.prepend SacCas::Event::RegisterController
       Event::RolesController.prepend SacCas::Event::RolesController
       GroupsController.permitted_attrs << :mitglied_termination_by_section_only
       GroupsController.permitted_attrs << {section_offering_ids: []}
diff --git a/spec/controllers/event/register_controller_spec.rb b/spec/controllers/event/register_controller_spec.rb
new file mode 100644
index 000000000..220bf87bd
--- /dev/null
+++ b/spec/controllers/event/register_controller_spec.rb
@@ -0,0 +1,55 @@
+#  Copyright (c) 2024, Schweizer Alpen-Club. This file is part of
+#  hitobito and licensed under the Affero General Public License version 3
+#  or later. See the COPYING file at the top-level directory or at
+#  https://github.com/hitobito/hitobito.
+
+require "spec_helper"
+
+describe Event::RegisterController do
+  include ActiveJob::TestHelper
+
+  let(:event) do
+    events(:top_event).tap do |e|
+      e.update_column(:external_applications, true)
+    end
+  end
+  let(:group) { event.groups.first }
+
+  let(:attrs) {
+    {
+      first_name: "Max",
+      last_name: "Muster",
+      street: "Musterplatz",
+      housenumber: "23",
+      email: "max.muster@example.com",
+      zip_code: "8000",
+      town: "Zürich",
+      country: "CH",
+      birthday: "01.01.1980",
+      phone_numbers_attributes: {
+        "0": {
+          number: "+41 79 123 45 56",
+          public: true,
+          translated_label: "Mobile"
+        }
+      }
+    }.with_indifferent_access
+  }
+
+  context "PUT register" do
+    context "with valid data" do
+      it "creates person and sends password reset instructions" do
+        event.update!(required_contact_attrs: [])
+
+        expect(Devise::Mailer).to receive(:reset_password_instructions).and_call_original
+
+        expect do
+          put :register, params: {group_id: group.id, id: event.id, event_participation_contact_data: attrs}
+        end.to change { Person.count }.by(1)
+
+        is_expected.to redirect_to(new_group_event_participation_path(group, event))
+        expect(flash[:notice]).to include "Deine persönlichen Daten wurden aufgenommen. Bitte ergänze nun noch die Angaben"
+      end
+    end
+  end
+end