diff --git a/app/models/competition.rb b/app/models/competition.rb
index 67a4989a041..b7d576ecbf8 100644
--- a/app/models/competition.rb
+++ b/app/models/competition.rb
@@ -1169,8 +1169,8 @@ def has_event_change_deadline_date?
 
   # can registration edits be done right now
   # must be allowed in general, and if the deadline field exists, is it a date and in the future
-  def registration_edits_allowed?
-    self.allow_registration_edits &&
+  def registration_edits_permitted?
+    !started? && self.allow_registration_edits &&
       (!has_event_change_deadline_date? || !event_change_deadline_date.present? || event_change_deadline_date > DateTime.now)
   end
 
@@ -1564,7 +1564,7 @@ def ineligible_events(user)
   end
 
   def started?
-    start_date.present? && start_date < Date.today
+    start_date.present? && start_date <= Date.today
   end
 
   def organizers_or_delegates
diff --git a/app/models/user.rb b/app/models/user.rb
index a6ed85808e6..cb598dea1eb 100644
--- a/app/models/user.rb
+++ b/app/models/user.rb
@@ -873,7 +873,7 @@ def can_view_hidden_competitions?
 
   def can_edit_registration?(registration)
     # A registration can be edited by a user if it hasn't been accepted yet, and if edits are allowed.
-    editable_by_user = (!registration.accepted? || registration.competition.registration_edits_allowed?)
+    editable_by_user = (!registration.accepted? || registration.competition.registration_edits_permitted?)
     can_manage_competition?(registration.competition) || (registration.user_id == self.id && editable_by_user)
   end
 
diff --git a/lib/registrations/registration_checker.rb b/lib/registrations/registration_checker.rb
index eb87bd08d7a..0c3cacd9627 100644
--- a/lib/registrations/registration_checker.rb
+++ b/lib/registrations/registration_checker.rb
@@ -78,7 +78,7 @@ def user_can_modify_registration!(competition, current_user, target_user, regist
         raise WcaExceptions::RegistrationError.new(:unauthorized, Registrations::ErrorCodes::USER_INSUFFICIENT_PERMISSIONS) unless
           can_administer_or_current_user?(competition, current_user, target_user)
         raise WcaExceptions::RegistrationError.new(:forbidden, Registrations::ErrorCodes::USER_EDITS_NOT_ALLOWED) unless
-          competition.registration_edits_allowed? || current_user.can_manage_competition?(competition) || user_uncancelling_registration?(registration, new_status)
+          competition.registration_edits_permitted? || current_user.can_manage_competition?(competition) || user_uncancelling_registration?(registration, new_status)
         raise WcaExceptions::RegistrationError.new(:unauthorized, Registrations::ErrorCodes::REGISTRATION_IS_REJECTED) if
           user_is_rejected?(current_user, target_user, registration) && !organizer_modifying_own_registration?(competition, current_user, target_user)
         raise WcaExceptions::RegistrationError.new(:forbidden, Registrations::ErrorCodes::ALREADY_REGISTERED_IN_SERIES) if
diff --git a/spec/lib/registrations/registration_checker_spec.rb b/spec/lib/registrations/registration_checker_spec.rb
index b86343aa737..f36a2bf0bae 100644
--- a/spec/lib/registrations/registration_checker_spec.rb
+++ b/spec/lib/registrations/registration_checker_spec.rb
@@ -797,6 +797,24 @@
         end
       end
 
+      it 'user cant change events after comp has started', :tag do
+        comp_started = FactoryBot.create(:competition, :ongoing, allow_registration_edits: true)
+        registration = FactoryBot.create(:registration, competition: comp_started)
+
+        update_request = FactoryBot.build(
+          :update_request,
+          competition_id: registration.competition.id,
+          user_id: registration.user_id,
+        )
+
+        expect {
+          Registrations::RegistrationChecker.update_registration_allowed!(update_request, Competition.find(update_request['competition_id']), User.find(update_request['submitted_by']))
+        }.to raise_error(WcaExceptions::RegistrationError) do |error|
+          expect(error.status).to eq(:forbidden)
+          expect(error.error).to eq(Registrations::ErrorCodes::USER_EDITS_NOT_ALLOWED)
+        end
+      end
+
       it 'user cant change events after event change deadline' do
         edit_deadline_passed = FactoryBot.create(:competition, :event_edit_passed)
         registration = FactoryBot.create(:registration, competition: edit_deadline_passed)