diff --git a/app/frontend/src/javascript/controllers/admin/events.js b/app/frontend/src/javascript/controllers/admin/events.js
index 87cade06b..d1288f4f2 100644
--- a/app/frontend/src/javascript/controllers/admin/events.js
+++ b/app/frontend/src/javascript/controllers/admin/events.js
@@ -516,6 +516,9 @@ Application.Controllers.controller('ShowEventReservationsController', ['$scope',
       templateUrl: '/admin/events/pay_reservation_modal.html',
       size: 'sm',
       resolve: {
+        event () {
+          return $scope.event;
+        },
         reservation () {
           return reservation;
         },
@@ -529,8 +532,10 @@ Application.Controllers.controller('ShowEventReservationsController', ['$scope',
           return mkCartItems(reservation);
         }
       },
-      controller: ['$scope', '$uibModalInstance', 'reservation', 'price', 'wallet', 'cartItems', 'helpers', '$filter', '_t', 'Reservation',
-        function ($scope, $uibModalInstance, reservation, price, wallet, cartItems, helpers, $filter, _t, Reservation) {
+      controller: ['$scope', '$uibModalInstance', 'reservation', 'price', 'wallet', 'cartItems', 'helpers', '$filter', '_t', 'Reservation', 'event',
+        function ($scope, $uibModalInstance, reservation, price, wallet, cartItems, helpers, $filter, _t, Reservation, event) {
+          $scope.event = event;
+
           // User's wallet amount
           $scope.wallet = wallet;
 
@@ -614,7 +619,11 @@ Application.Controllers.controller('ShowEventReservationsController', ['$scope',
         if (r.id === reservation.id) {
           return reservation;
         }
-        growl.success(_t('app.admin.event_reservations.reservation_was_successfully_paid'));
+        if ($scope.event.amount === 0) {
+          growl.success(_t('app.admin.event_reservations.reservation_was_successfully_present'));
+        } else {
+          growl.success(_t('app.admin.event_reservations.reservation_was_successfully_paid'));
+        }
         return r;
       });
     }, function () {
diff --git a/app/frontend/templates/admin/events/pay_reservation_modal.html b/app/frontend/templates/admin/events/pay_reservation_modal.html
index 766d1e68f..c1866fe17 100644
--- a/app/frontend/templates/admin/events/pay_reservation_modal.html
+++ b/app/frontend/templates/admin/events/pay_reservation_modal.html
@@ -1,45 +1,52 @@
 <div class="modal-header">
   <img ng-src="{{logoBlack.custom_asset_file_attributes.attachment_url}}" alt="{{logo.custom_asset_file_attributes.attachment}}" class="modal-logo"/>
-  <h1 translate ng-show="reservation">{{ 'app.admin.event_reservations.confirm_payment' }}</h1>
+  <h1 translate ng-show="reservation && event.amount !== 0">{{ 'app.admin.event_reservations.confirm_payment' }}</h1>
+  <h1 translate ng-show="reservation && event.amount === 0">{{ 'app.admin.event_reservations.confirm_present' }}</h1>
 </div>
 <div class="modal-body">
-  <uib-alert ng-repeat="alert in alerts" type="{{alert.type}}" close="closeAlert($index)">{{alert.msg}}</uib-alert>
-  <div class="row" ng-show="!offered">
-    <wallet-info current-user="currentUser"
-                 cart="cartItems"
-                 price="price.price"
-                 wallet="wallet"/>
-  </div>
-  <div class="row m-b">
-    <div class="col-md-12">
-      <label for="offerSlot" class="control-label m-r" translate>{{ 'app.admin.event_reservations.offer_this_reservation' }}</label>
-      <input bs-switch
-             ng-model="offered"
-             id="offerSlot"
-             type="checkbox"
-             class="form-control"
-             switch-on-text="{{ 'app.shared.buttons.yes' | translate }}"
-             switch-off-text="{{ 'app.shared.buttons.no' | translate }}"
-             switch-animate="true"
-             ng-change="computeEventAmount()"/>
+  <div ng-show="event.amount !== 0">
+    <div class="row" ng-show="!offered">
+      <wallet-info current-user="currentUser"
+                   cart="cartItems"
+                   price="price.price"
+                   wallet="wallet"/>
+    </div>
+    <div class="row m-b">
+      <div class="col-md-12">
+        <label for="offerSlot" class="control-label m-r" translate>{{ 'app.admin.event_reservations.offer_this_reservation' }}</label>
+        <input bs-switch
+               ng-model="offered"
+               id="offerSlot"
+               type="checkbox"
+               class="form-control"
+               switch-on-text="{{ 'app.shared.buttons.yes' | translate }}"
+               switch-off-text="{{ 'app.shared.buttons.no' | translate }}"
+               switch-animate="true"
+               ng-change="computeEventAmount()"/>
+      </div>
     </div>
-  </div>
 
-  <coupon show="true" coupon="coupon.applied" total="price.price_without_coupon" user-id="{{reservation.user_id}}"></coupon>
+    <coupon show="true" coupon="coupon.applied" total="price.price_without_coupon" user-id="{{reservation.user_id}}"></coupon>
 
-  <div class="row">
-    <div class="form-group col-sm-12">
-      <div class="checkbox-group">
-        <input type="checkbox"
-          name="paymentReceived"
-          id="paymentReceived"
-          ng-model="payment" />
-        <label for="paymentReceived" translate>{{ 'app.admin.event_reservations.i_have_received_the_payment' }}</label>
+    <div class="row">
+      <div class="form-group col-sm-12">
+        <div class="checkbox-group">
+          <input type="checkbox"
+            name="paymentReceived"
+            id="paymentReceived"
+            ng-model="payment" />
+          <label for="paymentReceived" translate>{{ 'app.admin.event_reservations.i_have_received_the_payment' }}</label>
+        </div>
       </div>
     </div>
   </div>
+
+  <div ng-if="event.amount === 0">
+    <p translate>{{ 'app.admin.event_reservations.confirm_present_info' }}</p>
+  </div>
 </div>
 <div class="modal-footer">
-  <button class="btn btn-info" ng-click="ok()" ng-disabled="attempting || !payment" ng-bind-html="validButtonName"></button>
+  <button class="btn btn-info" ng-if="event.amount !== 0" ng-click="ok()" ng-disabled="attempting || !payment" ng-bind-html="validButtonName"></button>
+  <button class="btn btn-info" ng-if="event.amount === 0" ng-click="ok()" ng-disabled="attempting" ng-bind-html="validButtonName"></button>
   <button class="btn btn-default" ng-click="cancel()" translate>{{ 'app.shared.buttons.cancel' }}</button>
 </div>
diff --git a/app/frontend/templates/admin/events/reservations.html b/app/frontend/templates/admin/events/reservations.html
index 5d65e4310..f9e4026ec 100644
--- a/app/frontend/templates/admin/events/reservations.html
+++ b/app/frontend/templates/admin/events/reservations.html
@@ -63,8 +63,9 @@
                     <input type="radio" name="validate" ng-value="true" ng-click="validateReservation(reservation)" ng-model="reservation.slots_reservations_attributes[0].is_valid" >
                   </label>
                 </div>
-                <button class="btn btn-default" ng-click="payReservation(reservation)" ng-if="isValidated(reservation) && !isCancelled(reservation) && !reservation.is_paid" translate>
-                  {{ 'app.admin.event_reservations.pay' }}
+                <button class="btn btn-default" ng-click="payReservation(reservation)" ng-if="isValidated(reservation) && !isCancelled(reservation) && !reservation.is_paid">
+                  <span ng-if="event.amount !== 0" translate>{{ 'app.admin.event_reservations.pay' }}</span>
+                  <span ng-if="event.amount === 0" translate>{{ 'app.admin.event_reservations.present' }}</span>
                 </button>
               </div>
             </td>
diff --git a/config/locales/app.admin.en.yml b/config/locales/app.admin.en.yml
index 27bb5ca10..4c872a5b2 100644
--- a/config/locales/app.admin.en.yml
+++ b/config/locales/app.admin.en.yml
@@ -668,6 +668,10 @@ en:
         offer_this_reservation: "I offer this reservation"
         i_have_received_the_payment:  "I have received the payment"
         reservation_was_successfully_paid: "Reservation was successfully paid."
+        present: "Present"
+        confirm_present: "Confirm presence"
+        confirm_present_info: "Confirm the presence of the user for this event"
+        reservation_was_successfully_present: "The presence of the user was successfully confirmed."
       events_settings:
         title: "Settings"
         generic_text_block: "Editorial text block"
diff --git a/config/locales/app.admin.fr.yml b/config/locales/app.admin.fr.yml
index 337b37dd5..afaa99d5d 100644
--- a/config/locales/app.admin.fr.yml
+++ b/config/locales/app.admin.fr.yml
@@ -668,6 +668,10 @@ fr:
         offer_this_reservation: "J'offre cette réservation"
         i_have_received_the_payment:  "J'ai reçu le paiement"
         reservation_was_successfully_paid: "La réservation a bien été payée."
+        present: "Présenter"
+        confirm_present: "Confirmer la présence"
+        confirm_present_info: "Confirmer la présence de l'utilisateur à l'événement"
+        reservation_was_successfully_present: "La présence a bien été confirmée."
       events_settings:
         title: "Paramètres"
         generic_text_block: "Bloc de texte rédactionnel"