diff --git a/src/pretix/control/views/subevents.py b/src/pretix/control/views/subevents.py
index c07a438c2..ef6a9bd6a 100644
--- a/src/pretix/control/views/subevents.py
+++ b/src/pretix/control/views/subevents.py
@@ -872,6 +872,9 @@ class SubEventBulkCreate(SubEventEditorMixin, EventPermissionRequiredMixin, Asyn
                 )
                 subevents.append(se)
 
+            if len(subevents) > 100_000:
+                raise ValidationError(_('Please do not create more than 100.000 dates at once.'))
+
         for i, se in enumerate(subevents):
             se.save(clear_cache=False)
             if i % 100 == 0: