diff --git a/golem_activity_session_registration/models/golem_activity_session_registration.py b/golem_activity_session_registration/models/golem_activity_session_registration.py
index 6c6aaeb..339f165 100644
--- a/golem_activity_session_registration/models/golem_activity_session_registration.py
+++ b/golem_activity_session_registration/models/golem_activity_session_registration.py
@@ -23,6 +23,26 @@ class GolemMember(models.Model):
 
     activity_session_registration_ids = fields.One2many(
         'golem.activity.session.registration', 'member_id', 'Activities')
+    has_draft_registrations = fields.Boolean(
+        'Has draft registrations ?',
+        compute='_compute_has_draft_registrations')
+
+    @api.one
+    @api.depends('activity_session_registration_ids')
+    def _compute_has_draft_registrations(self):
+        """ Check if there are draft states in member activities """
+        for r in self.activity_session_registration_ids:
+            if r.state == 'draft':
+                self.has_draft_registrations = True
+                return
+        self.has_draft_registrations = False
+
+    @api.one
+    def do_validate_registrations(self):
+        """ Validate all draft registrations """
+        draft_registrations = self.activity_session_registration_ids.filtered(
+            lambda r: r.state == 'draft')
+        draft_registrations.write({'state': 'confirmed'})
 
 
 class GolemActivitySession(models.Model):
diff --git a/golem_activity_session_registration/views/golem_activity_session_registration_view.xml b/golem_activity_session_registration/views/golem_activity_session_registration_view.xml
index e0e6e5b..e28293e 100644
--- a/golem_activity_session_registration/views/golem_activity_session_registration_view.xml
+++ b/golem_activity_session_registration/views/golem_activity_session_registration_view.xml
@@ -41,7 +41,7 @@ along with this program.  If not, see <http://www.gnu.org/licenses/>.
       <field name="model">golem.activity.session.registration</field>
       <field name="arch" type="xml">
         <tree create="true" edit="false" delete="false" editable="top"
-          colors="red: state == 'canceled';grey: state == 'draft';">
+          colors="red: state == 'canceled';darkgrey: state == 'draft';">
           <field name="state" invisible="1" />
           <field name="season_id" readonly="1" />
           <field name="member_id" domain="[('is_current', '=', True)]" />
diff --git a/golem_activity_session_registration/views/golem_activity_view.xml b/golem_activity_session_registration/views/golem_activity_view.xml
index a2d6a24..5c28578 100644
--- a/golem_activity_session_registration/views/golem_activity_view.xml
+++ b/golem_activity_session_registration/views/golem_activity_view.xml
@@ -34,7 +34,7 @@ along with this program.  If not, see <http://www.gnu.org/licenses/>.
               <field name="activity_session_registration_ids"
                 context="{'default_session_id': active_id}">
                 <tree editable="top"
-                  colors="red: state == 'canceled';grey: state == 'draft';">
+                  colors="red: state == 'canceled';darkgrey: state == 'draft';">
                   <field name="state" invisible="1" />
                   <field name="member_id"
                     domain="[('season_ids', '=', season_id)]" />
diff --git a/golem_activity_session_registration/views/golem_member_view.xml b/golem_activity_session_registration/views/golem_member_view.xml
index cbe2691..9a441c7 100644
--- a/golem_activity_session_registration/views/golem_member_view.xml
+++ b/golem_activity_session_registration/views/golem_member_view.xml
@@ -27,10 +27,20 @@ along with this program.  If not, see <http://www.gnu.org/licenses/>.
         <page name="other_page" position="before">
           <page name="sessions" string="Activities">
             <p>Default season activities</p>
+            <p>
+              <field name="has_draft_registrations" invisible="1" />
+              <button name="do_validate_registrations" type="object"
+                string="Validate all draft registrations"
+                class="oe_highlight"
+                help="If you validate draft registration, they will be seen as confirmed. Then, an invoice will be created for the current member."
+                attrs="{'invisible': [('has_draft_registrations', '=', False)]}" />
+              <!-- TODO : one by one cancelation -->
+              <!-- TODO : do not allow removal if confirmed -->
+            </p>
             <field name="activity_session_registration_ids"
               context="{'default_member_id': active_id}">
               <tree editable="top"
-                colors="red: state == 'canceled';grey: state == 'draft';">
+                colors="red: state == 'canceled';darkgrey: state == 'draft';">
                 <field name="state" invisible="1" />
                 <field name="session_id"
                   domain="[('is_current', '=', True)]" />