diff --git a/calendar_utils/icalevents/icaldownload.py b/calendar_utils/icalevents/icaldownload.py
index 6aadeddb706b011bc414b9d10640a73fa9985e31..bdc3262dc5ba60964602e401e48d3a08eedbd200 100644
--- a/calendar_utils/icalevents/icaldownload.py
+++ b/calendar_utils/icalevents/icaldownload.py
@@ -1,9 +1,10 @@
 """
 Downloads an iCal url or reads an iCal file.
 """
-from httplib2 import Http
 import logging
 
+from httplib2 import Http
+
 
 def apple_data_fix(content):
     """
diff --git a/calendar_utils/icalevents/icalevents.py b/calendar_utils/icalevents/icalevents.py
index 91ac0e2dbac7c24c248b14165012e3279b25bfcc..9e834f34d107deb538050832733145544a24d73a 100644
--- a/calendar_utils/icalevents/icalevents.py
+++ b/calendar_utils/icalevents/icalevents.py
@@ -1,8 +1,7 @@
 from threading import Lock, Thread
 
-from .icalparser import parse_events, Event
 from .icaldownload import ICalDownload
-
+from .icalparser import Event, parse_events
 
 # Lock for event data
 event_lock = Lock()
diff --git a/calendar_utils/icalevents/icalparser.py b/calendar_utils/icalevents/icalparser.py
index 80161afcea8508954587c62d419ed19ee21c4bc9..71198fe2d98d3eac4518cb1898d9e7feeb9f829b 100644
--- a/calendar_utils/icalevents/icalparser.py
+++ b/calendar_utils/icalevents/icalparser.py
@@ -1,19 +1,18 @@
 """
 Parse iCal data to Events.
 """
+from datetime import date, datetime, timedelta
+
 # for UID generation
 from faulthandler import is_enabled
 from random import randint
-from datetime import datetime, timedelta, date, tzinfo
 from typing import Optional
+from uuid import uuid4
 
 from dateutil.rrule import rrulestr
 from dateutil.tz import UTC, gettz
-
 from icalendar import Calendar
 from icalendar.prop import vDDDLists, vText
-from uuid import uuid4
-
 from icalendar.windows_to_olson import WINDOWS_TO_OLSON
 from pytz import timezone
 
@@ -107,7 +106,6 @@ class Event:
         return "%s: %s (%s)" % (self.start, self.summary, self.end - self.start)
 
     def astimezone(self, tzinfo):
-
         if type(self.start) is datetime:
             self.start = self.start.astimezone(tzinfo)
 
@@ -244,7 +242,11 @@ def create_event(component, utc_default):
 
     if component.get("categories"):
         categoriesval = component.get("categories")
-        categories = component.get("categories").cats if hasattr(categoriesval, "cats") else categoriesval
+        categories = (
+            component.get("categories").cats
+            if hasattr(categoriesval, "cats")
+            else categoriesval
+        )
         encoded_categories = list()
         for category in categories:
             encoded_categories.append(encode(category))
diff --git a/calendar_utils/migrations/0004_auto_20220505_1228.py b/calendar_utils/migrations/0004_auto_20220505_1228.py
index 62f0bfa4fdd74cc5b80b039913835228bdc47e36..5b5021f72bf70b907cef652bed3edfca2d470104 100644
--- a/calendar_utils/migrations/0004_auto_20220505_1228.py
+++ b/calendar_utils/migrations/0004_auto_20220505_1228.py
@@ -3,8 +3,8 @@ from datetime import date, timedelta
 
 import arrow
 from django.db import migrations
-from icalevents import icalevents
 
+from calendar_utils.icalevents import icalevents
 from calendar_utils.parser import process_event_list
 
 
diff --git a/calendar_utils/models.py b/calendar_utils/models.py
index c19a40d502a2883ad1ab1228cc39da68fd879361..d7b54e9b8ad82a6a36dfc04c301ee7e7f4b843c2 100644
--- a/calendar_utils/models.py
+++ b/calendar_utils/models.py
@@ -8,8 +8,8 @@ from django.core.serializers.json import DjangoJSONEncoder
 from django.core.validators import URLValidator, ValidationError
 from django.db import models, transaction
 from django.utils.timezone import now
-from icalevents import icalevents
 
+from .icalevents import icalevents
 from .parser import process_event_list
 from .tasks import update_calendar_source
 
diff --git a/calendar_utils/parser.py b/calendar_utils/parser.py
index 7698207bbfdaea29382b105efd733f3070d065ad..1ae18f193a2ecfceba6aa3e0f299438a5570b7e9 100644
--- a/calendar_utils/parser.py
+++ b/calendar_utils/parser.py
@@ -8,7 +8,7 @@ from django.conf import settings
 from django.utils.timezone import is_naive
 
 if TYPE_CHECKING:
-    from icalevents.icalparser import Event
+    from .icalevents.icalparser import Event
 
 EVENT_KEYS = ("start", "end", "all_day", "summary", "description", "location", "url")
 
diff --git a/tests/calendar_utils/conftest.py b/tests/calendar_utils/conftest.py
index f8241f1b8abb29a2324ca82afa15ac457b8053de..da268dc5402cd56fa3bc713f578c0ebf30f63ed0 100644
--- a/tests/calendar_utils/conftest.py
+++ b/tests/calendar_utils/conftest.py
@@ -3,7 +3,8 @@ from datetime import datetime
 from pathlib import Path
 
 import pytest
-from icalevents.icalparser import Event
+
+from calendar_utils.icalevents.icalparser import Event
 
 
 @pytest.fixture(scope="session")
diff --git a/tests/calendar_utils/test_parser.py b/tests/calendar_utils/test_parser.py
index b4f9a0743f86cd39dc8a54ff4ea9aeda500b76b5..8a98051f4292e23d7acd79f6cc70d899d2f10a23 100644
--- a/tests/calendar_utils/test_parser.py
+++ b/tests/calendar_utils/test_parser.py
@@ -1,8 +1,8 @@
 from datetime import datetime
 
 import pytest
-from icalevents.icalparser import Event
 
+from calendar_utils.icalevents.icalparser import Event
 from calendar_utils.parser import (
     process_event_list,
     set_event_duration,