diff --git a/app/controllers/guests_controller.rb b/app/controllers/guests_controller.rb
index 62530ce..0892c12 100644
--- a/app/controllers/guests_controller.rb
+++ b/app/controllers/guests_controller.rb
@@ -22,7 +22,13 @@ class GuestsController < ApplicationController
   end
 
   def update
-    guest = Guest.find(params[:id]).update!(guest_params)
+    guest = Guest.find(params[:id])
+    guest.update!(guest_params)
+
+    if !user_signed_in? && guest.saved_change_to_status?
+      AdminMailer.with(guest_id: guest.id).attendance_change_email.deliver_later
+    end
+
     render json: guest.as_json(GUEST_PARAMS), status: :ok
   end