Added setting to disable order cancelling for users

src/pretix/base/models/orders.py

@@ -227,6 +227,10 @@ class Order(LoggedModel):
 
         return False  # nothing there to modify
 
+    @property
+    def can_user_cancel(self) -> bool:
+        return self.event.settings.cancel_allow_user
+
     @property
     def is_expired_by_time(self):
         return (

src/pretix/base/settings.py

@@ -121,6 +121,10 @@ DEFAULTS = {
         'default': None,
         'type': datetime
     },
+    'cancel_allow_user': {
+        'default': 'True',
+        'type': bool
+    },
     'contact_mail': {
         'default': None,
         'type': str