diff --git a/calendar/amd/build/calendar.min.js b/calendar/amd/build/calendar.min.js
index 67a1cb2fa98..caacfa9f5e9 100644
--- a/calendar/amd/build/calendar.min.js
+++ b/calendar/amd/build/calendar.min.js
@@ -1 +1 @@
-define(["jquery","core/ajax","core/str","core/templates","core/notification","core/custom_interaction_events","core/modal_factory","core_calendar/summary_modal","core_calendar/calendar_repository"],function(a,b,c,d,e,f,g,h,i){var j={ROOT:"[data-region='calendar']",EVENT_LINK:"[data-action='view-event']"},k=null,l=function(a){var b="type"+a;return c.get_string(b,"core_calendar").then(function(a){return a}).fail(e.exception)},m=function(a){var b=i.getEventById(a);return b.then(function(a){return a.event?a.event:void b.fail(e.exception)}).then(function(a){return l(a.eventtype).then(function(b){return a.eventtype=b,a})}).then(function(a){return k.done(function(b){b.setTitle(a.name),b.setBody(d.render("core_calendar/event_summary_body",a)),0==a.caneditevent&&b.setFooter(""),b.show()})})},n=function(b){b=a(b);var c=!1;b.on("click",j.EVENT_LINK,function(b){if(!c){c=!0,b.preventDefault();var d=a(b.target).closest(j.EVENT_LINK),e=d.attr("data-event-id");m(e).done(function(){c=!1})}})};return{init:function(){k=g.create({type:h.TYPE}),n(j.ROOT)}}});
\ No newline at end of file
+define(["jquery","core/ajax","core/str","core/templates","core/notification","core/custom_interaction_events","core/modal_factory","core_calendar/summary_modal","core_calendar/calendar_repository"],function(a,b,c,d,e,f,g,h,i){var j={ROOT:"[data-region='calendar']",EVENT_LINK:"[data-action='view-event']"},k=null,l=function(a){var b="type"+a;return c.get_string(b,"core_calendar").then(function(a){return a})},m=function(a){return c.get_string("subsource","core_calendar",a).then(function(b){return a.url?'<a href="'+a.url+'">'+b+"</a>":b})},n=function(b){var c=i.getEventById(b);return c.then(function(a){return a.event?a.event:void c.fail(e.exception)}).then(function(a){var b=l(a.eventtype);return b.then(function(c){return c?(a.eventtype=c,a):void b.fail(e.exception)})}).then(function(b){if(1==b.displayeventsource){b.subscription=JSON.parse(b.subscription);var c=m({url:b.subscription.url,name:b.subscription.name});c?(a.Deferred().resolve(),c.done(function(a){b.source=a})):c.fail(e.exception)}return k.done(function(a){a.setTitle(b.name),a.setBody(d.render("core_calendar/event_summary_body",b)),0==b.caneditevent&&a.setFooter(""),a.show()})})},o=function(b){b=a(b);var c=!1;b.on("click",j.EVENT_LINK,function(b){if(!c){c=!0,b.preventDefault();var d=a(b.target).closest(j.EVENT_LINK),f=d.attr("data-event-id");n(f).done(function(){c=!1}).fail(e.exception)}})};return{init:function(){k=g.create({type:h.TYPE}),o(j.ROOT)}}});
\ No newline at end of file
diff --git a/calendar/amd/src/calendar.js b/calendar/amd/src/calendar.js
index 59dc033f13b..a4dcdeb50b3 100644
--- a/calendar/amd/src/calendar.js
+++ b/calendar/amd/src/calendar.js
@@ -36,13 +36,28 @@ define(['jquery', 'core/ajax', 'core/str', 'core/templates', 'core/notification'
          * Get the event type lang string.
          *
          * @param {String} eventType The event type.
-         * @return {String} The lang string of the event type.
+         * @return {promise} The lang string promise.
          */
         var getEventType = function(eventType) {
             var lang = 'type' + eventType;
             return Str.get_string(lang, 'core_calendar').then(function(langStr) {
                 return langStr;
-            }).fail(Notification.exception);
+            });
+        };
+
+        /**
+         * Get the event source.
+         *
+         * @param {Object} subscription The event subscription object.
+         * @return {promise} The lang string promise.
+         */
+        var getEventSource = function(subscription) {
+            return Str.get_string('subsource', 'core_calendar', subscription).then(function(langStr) {
+                if (subscription.url) {
+                    return '<a href="' + subscription.url + '">' + langStr + '</a>';
+                }
+                return langStr;
+            });
         };
 
         /**
@@ -53,20 +68,41 @@ define(['jquery', 'core/ajax', 'core/str', 'core/templates', 'core/notification'
          */
         var renderEventSummaryModal = function(eventId) {
 
-            var promise = CalendarRepository.getEventById(eventId);
 
-            return promise.then(function(result) {
+            // Calendar repository promise.
+            var repositoryPromise = CalendarRepository.getEventById(eventId);
+            return repositoryPromise.then(function(result) {
                 if (!result.event) {
-                    promise.fail(Notification.exception);
+                    repositoryPromise.fail(Notification.exception);
                 } else {
                     return result.event;
                 }
             }).then(function(eventdata) {
-                return getEventType(eventdata.eventtype).then(function(langStr) {
-                    eventdata.eventtype = langStr;
-                    return eventdata;
+                // Event type promise.
+                var eventTypePromise = getEventType(eventdata.eventtype);
+                return eventTypePromise.then(function(langStr) {
+                    if(!langStr) {
+                        eventTypePromise.fail(Notification.exception);
+                    } else {
+                        eventdata.eventtype = langStr;
+                        return eventdata;
+                    }
                 });
             }).then(function(eventdata) {
+                // If the calendar event has event source, get the language string or the link.
+                if (eventdata.displayeventsource == true) {
+                    eventdata.subscription = JSON.parse(eventdata.subscription);
+                    var eventpromise = getEventSource({url: eventdata.subscription.url, name: eventdata.subscription.name});
+                    if (eventpromise) {
+                        $.Deferred().resolve();
+                        eventpromise.done(function(source) {
+                            eventdata.source = source;
+                        });
+                    } else {
+                        eventpromise.fail(Notification.exception);
+                    }
+
+                }
                 return modalPromise.done(function(modal) {
                     modal.setTitle(eventdata.name);
                     modal.setBody(Templates.render('core_calendar/event_summary_body', eventdata));
@@ -99,7 +135,7 @@ define(['jquery', 'core/ajax', 'core/str', 'core/templates', 'core/notification'
 
                     renderEventSummaryModal(eventId).done(function() {
                         loading = false;
-                    });
+                    }).fail(Notification.exception);
                 }
             });
         };