Add social authentication with python-social-auth and social-auth-app-django. You will need to setup app id & secret in a ./local_settings.py file to use them

.gitignore

@@ -1,2 +1,3 @@
 *.sqlite*
 *.pyc
+*local_settings.*

events/templates/events/event_list.html

@@ -1,3 +1,13 @@
+{% if request.user.is_authenticated %}
+Welcome {{ request.user.username }}
+{% else %}
+Login:
+<a href="{% url 'social:begin' 'google-oauth2' %}">Google</a>
+<a href="{% url 'social:begin' 'facebook' %}">Facebook</a>
+<a href="{% url 'social:begin' 'twitter' %}">Twitter</a>
+<a href="{% url 'social:begin' 'github' %}">GitHub</a>
+<br>
+{% endif %}
 <center>{% if events_list %}
     <table border="0" width="960px">
     {% for event in events_list %}

get_together/settings.py

@@ -11,6 +11,11 @@ https://docs.djangoproject.com/en/2.0/ref/settings/
 """
 
 import os
+try:
+    from local_settings import *
+
+except:
+    print("WARNING: You should create a local_settings.py to store local and secret data.")
 
 # Build paths inside the project like this: os.path.join(BASE_DIR, ...)
 BASE_DIR = os.path.dirname(os.path.dirname(os.path.abspath(__file__)))
@@ -42,9 +47,24 @@ INSTALLED_APPS = [
 
     'django.contrib.sites',
     'rest_framework',
+    'social_django',
+
     'events',
 ]
 
+LOGIN_URL = 'login'
+LOGOUT_URL = 'logout'
+LOGIN_REDIRECT_URL = 'home'
+AUTHENTICATION_BACKENDS = (
+    'django.contrib.auth.backends.ModelBackend',
+    'social_core.backends.open_id.OpenIdAuth',
+    'social_core.backends.google.GoogleOAuth2',
+    'social_core.backends.github.GithubOAuth2',
+    'social_core.backends.twitter.TwitterOAuth',
+    'social_core.backends.facebook.FacebookOAuth2',
+    'social_core.backends.yahoo.YahooOpenId',
+)
+
 MIDDLEWARE = [
     'django.middleware.security.SecurityMiddleware',
     'django.contrib.sessions.middleware.SessionMiddleware',
@@ -53,6 +73,8 @@ MIDDLEWARE = [
     'django.contrib.auth.middleware.AuthenticationMiddleware',
     'django.contrib.messages.middleware.MessageMiddleware',
     'django.middleware.clickjacking.XFrameOptionsMiddleware',
+
+    'social_django.middleware.SocialAuthExceptionMiddleware',
 ]
 
 ROOT_URLCONF = 'get_together.urls'
@@ -68,7 +90,9 @@ TEMPLATES = [
                 'django.template.context_processors.request',
                 'django.contrib.auth.context_processors.auth',
                 'django.contrib.messages.context_processors.messages',
-            ],
+                'social_django.context_processors.backends',
+                'social_django.context_processors.login_redirect',
+             ],
         },
     },
 ]

get_together/urls.py

@@ -14,11 +14,13 @@ Including another URLconf
     2. Add a URL to urlpatterns:  path('blog/', include('blog.urls'))
 """
 from django.contrib import admin
-from django.urls import path
+from django.urls import path, include
 from events import views
 
 urlpatterns = [
     path('admin/', admin.site.urls),
     path('searchables/', views.searchable_list),
-    path('events/', views.events_list),
+    path('events/', views.events_list, name='home'),
+
+    path('oauth/', include('social_django.urls', namespace='social')),
 ]

requirements.txt

@@ -1,4 +1,17 @@
+certifi==2017.11.5
+chardet==3.0.4
+defusedxml==0.5.0
 Django==2.0
 djangorestframework==3.7.7
+idna==2.6
+oauthlib==2.0.6
+PyJWT==1.5.3
+python3-openid==3.1.0
 pytz==2017.3
+requests==2.18.4
+requests-oauthlib==0.8.0
 simplejson==3.13.2
+six==1.11.0
+social-auth-app-django==2.1.0
+social-auth-core==1.6.0
+urllib3==1.22