diff --git a/aleksis/apps/chronos/managers.py b/aleksis/apps/chronos/managers.py
index a2193046c1c3d86a3a68642b9669ba1d6fc34322..fae25d1817462aa3f0fd0babf619bf480cb65320 100644
--- a/aleksis/apps/chronos/managers.py
+++ b/aleksis/apps/chronos/managers.py
@@ -905,7 +905,8 @@ class LessonEventQuerySet(PolymorphicQuerySet):
 
     def related_to_person(self, person: Union[int, Person]):
         amended = self.filter(
-            Q(amended_by__isnull=False) & (Q(teachers=person) | Q(groups__members=person) | Q(groups__owners=person))
+            Q(amended_by__isnull=False)
+            & (Q(teachers=person) | Q(groups__members=person) | Q(groups__owners=person))
         ).values_list("amended_by__pk", flat=True)
         return self.filter(
             Q(teachers=person) | Q(groups__members=person) | Q(groups__owners=person)
diff --git a/aleksis/apps/chronos/models.py b/aleksis/apps/chronos/models.py
index 944095e713fd9fc8498af60b97cc3e5d3748372f..5bf42890ef4833a8fddb086bc7a1f5530dde4007 100644
--- a/aleksis/apps/chronos/models.py
+++ b/aleksis/apps/chronos/models.py
@@ -8,7 +8,7 @@ from itertools import chain
 from typing import Any
 
 from django.contrib.contenttypes.models import ContentType
-from django.core.exceptions import ValidationError, PermissionDenied
+from django.core.exceptions import PermissionDenied, ValidationError
 from django.core.validators import MinValueValidator
 from django.db import models
 from django.db.models import Max, Min, Q
@@ -1535,7 +1535,7 @@ class LessonEvent(CalendarEvent):
     def get_objects(cls, request, params=None) -> Iterable:
         """Return all objects that should be included in the calendar."""
         objs = super().get_objects(request, params).not_instance_of(SupervisionEvent)
-        
+
         if not has_person(request.user):
             raise PermissionDenied()
 
diff --git a/aleksis/apps/chronos/schema/__init__.py b/aleksis/apps/chronos/schema/__init__.py
index 3986fa922160fa33772d6e1cb7e152c59066c861..b746fc21e8344af3367d53d5d0d7abfff79cd708 100644
--- a/aleksis/apps/chronos/schema/__init__.py
+++ b/aleksis/apps/chronos/schema/__init__.py
@@ -46,14 +46,12 @@ class TimetableObjectType(graphene.ObjectType):
 
     def resolve_id(root, info, **kwargs):
         return f"{root.type.value}-{root.id}"
-        
-        
+
+
 class LessonEventType(DjangoObjectType):
     class Meta:
         model = LessonEvent
-        fields = (
-            "id",
-        )
+        fields = ("id",)
         filter_fields = {
             "id": ["exact", "lte", "gte"],
         }