old_contents: from ckeditor.fields import RichTextField
  from django.contrib.gis.db import models
  from django.contrib.auth.models import User
  from django.contrib.admin import widgets  
  
  
  class Event(models.Model):
      start_time = models.DateTimeField(db_index=True, verbose_name="Start wydarzenia")
      end_time = models.DateTimeField(db_index=True, blank=True, null=True, verbose_name="Koniec wydarzenia")
      title = models.CharField(max_length=120, verbose_name="Tytuł")
      description = RichTextField()
      image = models.ImageField(upload_to='event/%Y/%m/%d/', blank=True, null=True, verbose_name="Plakat")
      place = models.CharField(max_length=120, verbose_name="Miejsce")
      point = models.PointField(blank=True, null=True, verbose_name="Miejsce na mapie")
      orgs = models.ManyToManyField('Organizer', related_name='events')
  
      url = models.URLField(blank=True, null=True,verbose_name="Adres www")
      objects = models.GeoManager()
  
      def __str__(self):
          return self.title
  
  
  class Organizer(models.Model):
      name = models.CharField(max_length=200, verbose_name="Nazwa")
      logo = models.ImageField(upload_to='logo/%m/', blank=True, null=True, verbose_name="Logo")
      user = models.OneToOneField(User, blank=True, null=True, related_name='organizer')
  
      def __str__(self):
          return self.name
new_contents: from ckeditor.fields import RichTextField
  from django.contrib.gis.db import models
  from django.contrib.auth.models import User
  from django.contrib.admin import widgets  
  
  
  class Event(models.Model):
      start_time = models.DateTimeField(db_index=True, verbose_name="Start wydarzenia")
      end_time = models.DateTimeField(db_index=True, blank=True, null=True, verbose_name="Koniec wydarzenia")
      title = models.CharField(max_length=120, verbose_name="Tytuł")
      description = RichTextField(verbose_name="Opis wydarzenia")
      image = models.ImageField(upload_to='event/%Y/%m/%d/', blank=True, null=True, verbose_name="Plakat")
      place = models.CharField(max_length=120, verbose_name="Miejsce")
      point = models.PointField(blank=True, null=True, verbose_name="Miejsce na mapie")
      orgs = models.ManyToManyField('Organizer', related_name='events', verbose_name="Organizator")
  
      url = models.URLField(blank=True, null=True,verbose_name="Adres www")
      objects = models.GeoManager()
  
      def __str__(self):
          return self.title
  
  
  class Organizer(models.Model):
      name = models.CharField(max_length=200, verbose_name="Nazwa")
      logo = models.ImageField(upload_to='logo/%m/', blank=True, null=True, verbose_name="Logo")
      user = models.OneToOneField(User, blank=True, null=True, related_name='organizer', verbose_name="Użytkownik")
  
      def __str__(self):
          return self.name
  
subject: Use Polish labels.