[FIX] event :

- dates are editable even in confirm state. Only events in done states are
  not editable.
- the print badge button is actually a button to edit badges, so let us udpate
  the name

addons/event/models/event.py

@@ -122,10 +122,10 @@ class event_event(models.Model):
     date_tz = fields.Selection('_tz_get', string='Timezone', default=lambda self: self.env.user.tz)
     date_begin = fields.Datetime(
         string='Start Date', required=True,
-        readonly=True, states={'draft': [('readonly', False)]})
+        track_visibility='onchange', states={'done': [('readonly', True)]})
     date_end = fields.Datetime(
         string='End Date', required=True,
-        readonly=True, states={'draft': [('readonly', False)]})
+        track_visibility='onchange', states={'done': [('readonly', True)]})
     date_begin_located = fields.Datetime(string='Start Date Located', compute='_compute_date_begin_tz')
     date_end_located = fields.Datetime(string='End Date Located', compute='_compute_date_end_tz')
 

addons/website_event/views/website_event_backend.xml

@@ -22,12 +22,12 @@
                 <button name="action_open_badge_editor"
                     type="object"
                     states="confirm"
-                    string="Print Badges"
+                    string="Edit Badges"
                     class="oe_highlight"/>
                 <button name="action_open_badge_editor"
                     type="object"
                     states="done"
-                    string="Print Badges"/>
+                    string="Edit Badges"/>
             </xpath>
         </field>
     </record>