Add waiting list

src/pretix/control/forms/event.py

@@ -187,6 +187,27 @@ class EventSettingsForm(SettingsForm):
         help_text=_("Publicly show how many tickets of a certain type are still available."),
         required=False
     )
+    waiting_list_enabled = forms.BooleanField(
+        label=_("Enable waiting list"),
+        help_text=_("Once a ticket is sold out, people can add themselves to a waiting list. As soon as a ticket "
+                    "becomes available again, it will be reserved for the first person on the waiting list and this "
+                    "person will receive an email notification with a voucher that can be used to buy a ticket."),
+        required=False
+    )
+    waiting_list_hours = forms.IntegerField(
+        label=_("Waiting list response time"),
+        min_value=6,
+        help_text=_("If a ticket voucher is sent to a person on the waiting list, it has to be redeemed within this "
+                    "number of hours until it expires and can be re-assigned to the next person on the list."),
+        required=False
+    )
+    waiting_list_auto = forms.BooleanField(
+        label=_("Automatic waiting list assignments"),
+        help_text=_("If ticket capacity becomes free, automatically create a voucher and send it to the first person "
+                    "on the waiting list for that product. If this is not active, mails will not be send automatically "
+                    "but you can send them manually via the control panel."),
+        required=False
+    )
     attendee_names_asked = forms.BooleanField(
         label=_("Ask for attendee names"),
         help_text=_("Ask for a name for all tickets which include admission to the event."),
@@ -433,6 +454,12 @@ class MailSettingsForm(SettingsForm):
         widget=I18nTextarea,
         help_text=_("Available placeholders: {event}, {url}, {expire_date}, {invoice_name}, {invoice_company}")
     )
+    mail_text_waiting_list = I18nFormField(
+        label=_("Text"),
+        required=False,
+        widget=I18nTextarea,
+        help_text=_("Available placeholders: {event}, {url}, {product}, {hours}, {code}")
+    )
     smtp_use_custom = forms.BooleanField(
         label=_("Use custom SMTP server"),
         help_text=_("All mail related to your event will be sent over the smtp server specified by you."),