diff --git a/src/pretix/base/migrations/0299_fixup_eventmetaproperties.py b/src/pretix/base/migrations/0299_fixup_eventmetaproperties.py
new file mode 100644
index 000000000..d00fb3d69
--- /dev/null
+++ b/src/pretix/base/migrations/0299_fixup_eventmetaproperties.py
@@ -0,0 +1,81 @@
+# Generated by Django 5.2.12 on 2026-04-28 11:34
+import logging
+
+from django.db import IntegrityError, migrations, transaction
+from django.db.models import Count, F
+
+logger = logging.getLogger(__name__)
+
+
+def fix_cross_organizer_eventmetavalues(apps, schema_editor):
+    EventMetaProperty = apps.get_model("pretixbase", "EventMetaProperty")
+    EventMetaValue = apps.get_model("pretixbase", "EventMetaValue")
+
+    cross_org_values = EventMetaValue.objects.filter(event__organizer__pk__ne=F('property__organizer__pk'))
+    for emv in cross_org_values:
+        logger.info(f"Fixup cross-organizer value {emv.event.organizer.slug}/{emv.event.slug}\n  before: {emv.property.name}({emv.property.id}@{emv.property.organizer.slug}) = {emv.value}")
+        try:
+            emv.property = emv.event.organizer.meta_properties.filter(name=emv.property.name).first()
+            logger.info(f"  found existing EventMetaProperty in {emv.event.organizer.slug}")
+            if EventMetaValue.objects.filter(event=emv.event, property=emv.property).exists():
+                logger.info(f"  EventMetaValue with property in correct organizer already exists, deleting the cross-organizer one")
+                emv.delete()
+                continue
+        except EventMetaProperty.DoesNotExist:
+            meta_prop = emv.property
+            meta_prop.pk = None
+            meta_prop.organizer = emv.event.organizer
+            meta_prop.save(force_insert=True)
+            logger.info(f"  created new EventMetaProperty")
+            emv.property = meta_prop
+        logger.info(f"  after: {emv.property.name}({emv.property.id}@{emv.property.organizer.slug}) = {emv.value}")
+        emv.save(update_fields=["property"])
+
+
+def make_eventmetaproperties_unique(apps, schema_editor):
+    EventMetaProperty = apps.get_model("pretixbase", "EventMetaProperty")
+    EventMetaValue = apps.get_model("pretixbase", "EventMetaValue")
+
+    duplicates = EventMetaProperty.objects.values('organizer', 'organizer__slug', 'name').annotate(count=Count('id')).filter(count__gt=1)
+    for dup in duplicates:
+        logger.info(f"Fixup duplicate property {dup['organizer__slug']} {dup['name']}")
+        props = list(EventMetaProperty.objects.filter(organizer=dup['organizer'], name=dup['name']))
+
+        # TODO: any better idea than picking the property to keep more or less randomly (first in database order)?
+        target = props[0]
+        invalid = props[1:]
+
+        try:
+            with transaction.atomic():
+                affected = EventMetaValue.objects.filter(
+                    event__organizer=dup['organizer'], property__in=invalid
+                ).update(
+                    property=target
+                )
+                logger.info(f"  Switching {affected} value(s) over to {target.name}({target.id}@{target.organizer.slug})")
+
+        except IntegrityError as e:
+            logger.info(f"  Failed to switch all value(s) over to {target.name}({target.id}@{target.organizer.slug})")
+            logger.info(f"  {e}")
+            for prop in invalid:
+                newname = f'{prop.name}_DUPLICATE_{prop.id}'
+                logger.info(f"  Renaming {prop.name}({prop.id}@{prop.organizer.slug}) to {newname}({prop.id}@{prop.organizer.slug})")
+                prop.name = newname
+                prop.save()
+
+        else:
+            for prop in invalid:
+                logger.info(f"  Deleting {prop.name}({prop.id}@{prop.organizer.slug})")
+                prop.delete()
+
+
+class Migration(migrations.Migration):
+
+    dependencies = [
+        ("pretixbase", "0298_pluggable_permissions"),
+    ]
+
+    operations = [
+        migrations.RunPython(fix_cross_organizer_eventmetavalues, migrations.RunPython.noop),
+        migrations.RunPython(make_eventmetaproperties_unique, migrations.RunPython.noop),
+    ]
diff --git a/src/pretix/base/migrations/0300_alter_eventmetaproperty_unique_together.py b/src/pretix/base/migrations/0300_alter_eventmetaproperty_unique_together.py
new file mode 100644
index 000000000..5d992fb3c
--- /dev/null
+++ b/src/pretix/base/migrations/0300_alter_eventmetaproperty_unique_together.py
@@ -0,0 +1,17 @@
+# Generated by Django 5.2.12 on 2026-04-28 11:34
+
+from django.db import migrations
+
+
+class Migration(migrations.Migration):
+
+    dependencies = [
+        ("pretixbase", "0299_fixup_eventmetaproperties"),
+    ]
+
+    operations = [
+        migrations.AlterUniqueTogether(
+            name="eventmetaproperty",
+            unique_together={("organizer", "name")},
+        ),
+    ]
diff --git a/src/pretix/base/models/event.py b/src/pretix/base/models/event.py
index 1e6c17461..a9cbf40dc 100644
--- a/src/pretix/base/models/event.py
+++ b/src/pretix/base/models/event.py
@@ -1847,6 +1847,7 @@ class EventMetaProperty(LoggedModel):
 
     class Meta:
         ordering = ("position", "name",)
+        unique_together = ('organizer', 'name')
 
     @property
     def choice_keys(self):