designed all htmls,hyperlinks and buttons all working

widget_gitgud/widgetcalendar/templates/widgetcalendar/calendar.html

+{% extends 'base.html' %}
+{% load static %} 
+
+{% block title %} Widget's Calendar of Activities {% endblock %} 
+{% block content %} 
+<h1>Widget's Calendar of Activities</h1>
+<ul>
+    {% for object in events %} 
+        <li>
+            <a href="{{ object.get_absolute_url }}">{{ object.activity }}</a>
+        </li>
+    {% endfor %}
+</ul>
+<button onclick="window.location.href='../../Calendar/events/add/';">
+    New Activity
+</button>
+<p>
+    <a href="/Dashboard">Dashboard</a><br>
+    <a href="/Announcement">Announcements</a><br>
+    <a href="/Forum">Forum</a><br>
+    <a href="/Assignments">Assignments</a>
+</p>
+{% endblock %} 
\ No newline at end of file

widget_gitgud/widgetcalendar/templates/widgetcalendar/event-add.html

+{% extends 'base.html' %}
+{% load static %} 
+{% block title %} Add Activity {% endblock %} 
+{% block content %}
+    <h1>Add a New Activity</h1>    
+    <form action="" method="post">
+            {% csrf_token %}
+            {{ form.as_p }}
+            <input type="submit" value="Save New Activity">
+    </form>
+{% endblock %}

widget_gitgud/widgetcalendar/templates/widgetcalendar/event-details.html

+{% extends 'base.html' %}
+{% load static %} 
+
+{% block title %} {{ object.activity }}{% endblock %}
+{% block content %}
+
+<h1>{{ object.activity }}</h1>
+<h2>Date and Time: {{ object.target_datetime|date:"m/d/Y, "}}{{ object.target_datetime|time:"h:i A" }} </h2>
+<h2>Estimated Hours: {{ object.estimated_hours }}</h2>
+<h2>{{ object.course.code }} {{ object.course.title }} - {{ object.course.section }}</h2>
+<ul>
+    <li>Mode: {{ object.location.mode }}</li>
+    <li>Venue: {{ object.location.venue }}</li>
+</ul>
+<button onclick="document.location='{{object.get_edit_url}}'">
+    Edit Activity
+</button>
+{% comment %} <button onclick="document.location='{{object.get_edit_url}}'">Edit Activity</button> {% endcomment %}
+{% endblock %}

widget_gitgud/widgetcalendar/templates/widgetcalendar/event-edit.html

+{% extends 'base.html' %}
+{% load static %} 
+{% block title %} Edit Activity {% endblock %} 
+{% block content %}
+    <h1>Edit Assignment</h1>    
+    <form action="" method="post">
+            {% csrf_token %}
+            {{ form.as_p }}
+            <input type="submit" value="Save Changes to Activity">
+    </form>
+{% endblock %}

widget_gitgud/widgetcalendar/urls.py

@@ -4,6 +4,7 @@ urlpatterns = [
 path('', index, name='Calendar'),
 path('events/<int:pk>/details/', EventDetailView.as_view(), name ="event-detail"),
 path('events/add/', AddEventView.as_view(), name ="event-add"),
+path('events/<int:pk>/edit/', EditEventView.as_view(), name ="event-edit"),
 ]
 
 app_name = "widgetcalendar"
\ No newline at end of file