Allow to delete organizers

src/pretix/control/forms/organizer.py

@@ -31,6 +31,29 @@ class OrganizerForm(I18nModelForm):
         return slug
 
 
+class OrganizerDeleteForm(forms.Form):
+    error_messages = {
+        'slug_wrong': _("The slug you entered was not correct."),
+    }
+    slug = forms.CharField(
+        max_length=255,
+        label=_("Event slug"),
+    )
+
+    def __init__(self, *args, **kwargs):
+        self.organizer = kwargs.pop('organizer')
+        super().__init__(*args, **kwargs)
+
+    def clean_slug(self):
+        slug = self.cleaned_data.get('slug')
+        if slug != self.organizer.slug:
+            raise forms.ValidationError(
+                self.error_messages['slug_wrong'],
+                code='slug_wrong',
+            )
+        return slug
+
+
 class OrganizerUpdateForm(OrganizerForm):
 
     def __init__(self, *args, **kwargs):