Modelos:

persona.py

#
from model_utils.models import TimeStampedModel
#
from django.db import models

#
class Hobby(TimeStampedModel):
    hobby = models.CharField(
        'Pasatiempo',
         max_length=50,
    ) 

    class Meta:
        verbose_name='Hobby'
        verbose_name_plural='Hobbies'

    def __str__(self):

        return self.hobby

#
class Person(TimeStampedModel):
    """  Modelo para registrar personas de una agenda  """

    full_name = models.CharField(
        'Nombres', 
        max_length=50,
    )
    job = models.CharField(
        'Trabajo', 
        max_length=30,
        blank=True
    )
    email = models.EmailField(
        blank=True, 
        null=True
    )
    phone = models.CharField(
        'telefono',
        max_length=15,
        blank=True,
    )

    hobbies = models.ManyToManyField(Hobby) 


    class Meta:
        verbose_name = 'Persona'
        verbose_name_plural = 'Personas'
    
    def __str__(self):
        return self.full_name



class Reunion(TimeStampedModel):
    """  Modelo para reunion  """

    persona = models.ForeignKey(
        Person, 
        on_delete=models.CASCADE
    )
    fecha = models.DateField()
    hora = models.TimeField()
    asunto = models.CharField(
        'Aunto de Reunion',
        max_length=100
    )
    

    class Meta:
        verbose_name = 'Reunion'
        verbose_name_plural = 'Reunion'
    
    def __str__(self):
        return self.asunto

views.py

from django.shortcuts import render

from django.views.generic import ListView,TemplateView

#
from rest_framework.generics import (
    ListAPIView,
    CreateAPIView,
    RetrieveAPIView,  #Detailview
    DestroyAPIView,
    UpdateAPIView,
    RetrieveUpdateAPIView,
)

urls.py

#
from django.urls import path,re_path
#
from .import views

app_name='persona_app'

urlpatterns = [
    path(
    )
]

Archivos de Configuracion

base.py

from django.core.exceptions import ImproperlyConfigured
import json


# Build paths inside the project like this: os.path.join(BASE_DIR, ...)
from unipath import Path
BASE_DIR = Path(__file__).ancestor(3)


# Quick-start development settings - unsuitable for production
# See https://docs.djangoproject.com/en/2.2/howto/deployment/checklist/

# SECURITY WARNING: keep the secret key used in production secret!
with open("secret.json") as f:
    secret = json.loads(f.read())

def get_secret(secret_name, secrets=secret):
    try:
        return secrets[secret_name]
    except:
        msg = "la variable %s no existe" % secret_name
        raise ImproperlyConfigured(msg)



SECRET_KEY = get_secret('SECRET_KEY')


# Application definition

DJANGO_APPS = (
    'django.contrib.admin',
    'django.contrib.auth',
    'django.contrib.contenttypes',
    'django.contrib.sessions',
    'django.contrib.messages',
    'django.contrib.staticfiles',
)

LOCAL_APPS = (
    'applications.home',
    'applications.persona',
)

THIRD_PARTY_APPS = (
    'rest_framework',
)

INSTALLED_APPS = DJANGO_APPS + LOCAL_APPS + THIRD_PARTY_APPS

MIDDLEWARE = [
    'django.middleware.security.SecurityMiddleware',
    'django.contrib.sessions.middleware.SessionMiddleware',
    'django.middleware.common.CommonMiddleware',
    'django.middleware.csrf.CsrfViewMiddleware',
    'django.contrib.auth.middleware.AuthenticationMiddleware',
    'django.contrib.messages.middleware.MessageMiddleware',
    'django.middleware.clickjacking.XFrameOptionsMiddleware',
]

ROOT_URLCONF = 'agenda.urls'

TEMPLATES = [
    {
        'BACKEND': 'django.template.backends.django.DjangoTemplates',
        'DIRS': [BASE_DIR.child('templates')],
        'APP_DIRS': True,
        'OPTIONS': {
            'context_processors': [
                'django.template.context_processors.debug',
                'django.template.context_processors.request',
                'django.contrib.auth.context_processors.auth',
                'django.contrib.messages.context_processors.messages',
            ],
        },
    },
]

WSGI_APPLICATION = 'agenda.wsgi.application'


# Password validation
# https://docs.djangoproject.com/en/2.2/ref/settings/#auth-password-validators

AUTH_PASSWORD_VALIDATORS = [
    {
        'NAME': 'django.contrib.auth.password_validation.UserAttributeSimilarityValidator',
    },
    {
        'NAME': 'django.contrib.auth.password_validation.MinimumLengthValidator',
    },
    {
        'NAME': 'django.contrib.auth.password_validation.CommonPasswordValidator',
    },
    {
        'NAME': 'django.contrib.auth.password_validation.NumericPasswordValidator',
    },
]

# Internationalization
# https://docs.djangoproject.com/en/2.2/topics/i18n/

LANGUAGE_CODE = 'en-us'

TIME_ZONE = 'UTC'

USE_I18N = True

USE_L10N = True

USE_TZ = True

local.py

from .base import *
# SECURITY WARNING: don't run with debug turned on in production!
DEBUG = True

ALLOWED_HOSTS = []

# Database
# https://docs.djangoproject.com/en/2.2/ref/settings/#databases

DATABASES = {
    'default': {
        'ENGINE': 'django.db.backends.postgresql_psycopg2',
        'NAME': get_secret('DB_NAME'),
        'USER': get_secret('USER'),
        'PASSWORD': get_secret('PASSWORD'),
        'HOST': 'localhost',
        'PORT': '5432',
    }
}
# Static files (CSS, JavaScript, Images)
# https://docs.djangoproject.com/en/2.2/howto/static-files/

STATIC_URL = '/static/'
STATICFILES_DIRS = [BASE_DIR.child('static')]

MEDIA_URL = '/media/'
MEDIA_ROOT = BASE_DIR.child('media')

urls.py

"""agenda URL Configuration

The `urlpatterns` list routes URLs to views. For more information please see:
    https://docs.djangoproject.com/en/3.0/topics/http/urls/
Examples:
Function views
    1. Add an import:  from my_app import views
    2. Add a URL to urlpatterns:  path('', views.home, name='home')
Class-based views
    1. Add an import:  from other_app.views import Home
    2. Add a URL to urlpatterns:  path('', Home.as_view(), name='home')
Including another URLconf
    1. Import the include() function: from django.urls import include, path
    2. Add a URL to urlpatterns:  path('blog/', include('blog.urls'))
"""
from django.contrib import admin
from django.urls import path, re_path, include

urlpatterns = [
    path('admin/', admin.site.urls),
    re_path('', include('applications.persona.urls')),
]