BIG UPD: migrate to python 3.10 and django 3.2

dav_events/models/event.py

@@ -10,10 +10,9 @@ import unicodedata
 from babel.dates import format_date
 from django.conf import settings
 from django.contrib.auth import get_user_model
-from django.core.urlresolvers import reverse
+from django.urls import reverse
 from django.db import models
 from django.template.loader import get_template
-from django.utils.encoding import python_2_unicode_compatible
 from django.utils.translation import get_language, ugettext_lazy as _
 from django_countries.fields import Country, CountryField
 
@@ -27,7 +26,6 @@ from .eventchange import EventChange
 logger = logging.getLogger(__name__)
 
 
-@python_2_unicode_compatible
 class Event(models.Model):
     # Metadata
     owner = models.ForeignKey(settings.AUTH_USER_MODEL,