diff --git a/admin/calendar.php b/admin/calendar.php
index 84e8285f..6e34289c 100644
--- a/admin/calendar.php
+++ b/admin/calendar.php
@@ -47,7 +47,11 @@ hesk_isLoggedIn();
 //hesk_checkPermission('can_service_msg');
 
 // Define required constants
-define('MFH_CALENDAR', 1);
+if (hesk_checkPermission('can_man_calendar', 0)) {
+    define('MFH_CALENDAR', 1);
+} else {
+    define('MFH_CALENDAR_READONLY', 1);
+}
 
 // Get categories for the dropdown
 $rs = hesk_dbQuery("SELECT `id`, `name`, `color` FROM `" . hesk_dbEscape($hesk_settings['db_pfix']) . "categories` WHERE `usage` <> 1 ORDER BY `cat_order`");
@@ -90,13 +94,17 @@ require_once(HESK_PATH . 'inc/show_admin_nav.inc.php');
         <div class="panel panel-default">
             <div class="panel-heading">
                 <h4>
-                    <?php echo $hesklang['calendar_title_case']; ?>
+                    <?php
+                    echo $hesklang['calendar_title_case'];
+                    if (hesk_checkPermission('can_man_calendar', 0)):
+                    ?>
                     <span class="nu-floatRight panel-button">
                         <button class="btn btn-success" id="create-event-button">
                             <i class="fa fa-plus-circle"></i>
                             <?php echo $hesklang['new_event']; ?>
                         </button>
                     </span>
+                    <?php endif; ?>
                 </h4>
             </div>
             <div class="panel-body">
diff --git a/inc/common.inc.php b/inc/common.inc.php
index b2b523b3..b6f4de9a 100644
--- a/inc/common.inc.php
+++ b/inc/common.inc.php
@@ -1762,6 +1762,7 @@ function hesk_getFeatureArray()
         'can_man_settings', /* User can manage helpdesk settings */
         'can_change_notification_settings', /* User can change notification settings */
         'can_view_logs', /* User can view the message logs */
+        'can_man_calendar', /* User can manage calendar events */
     );
 }
 
diff --git a/inc/header.inc.php b/inc/header.inc.php
index 76cd524d..f5f43efc 100644
--- a/inc/header.inc.php
+++ b/inc/header.inc.php
@@ -249,7 +249,7 @@ if (is_dir(HESK_PATH . 'install')) {
         ?>
         <script src="<?php echo HESK_PATH; ?>js/calendar/moment.js"></script>
         <script src="<?php echo HESK_PATH; ?>js/calendar/fullcalendar.min.js"></script>
-        <script type="text/javascript" src="<?php echo HESK_PATH; ?>js/calendar/mods-for-hesk-customer-calendar.js"></script>
+        <script type="text/javascript" src="<?php echo HESK_PATH; ?>js/calendar/mods-for-hesk-calendar-readonly.js"></script>
     <?php
     }
     ?>
diff --git a/inc/headerAdmin.inc.php b/inc/headerAdmin.inc.php
index 3d8dc387..5dec2e64 100644
--- a/inc/headerAdmin.inc.php
+++ b/inc/headerAdmin.inc.php
@@ -95,7 +95,7 @@ $modsForHesk_settings = mfh_getSettings();
     <script type="text/javascript" src="//cdnjs.cloudflare.com/ajax/libs/leaflet/0.7.3/leaflet.js"></script>
     <script type="text/javascript" src="<?php echo HESK_PATH; ?>js/platform.js"></script>
     <script type="text/javascript" src="<?php echo HESK_PATH; ?>js/bootstrap-validator.min.js"></script>
-    <script type="text/javascript" src="<?php echo HESK_PATH; ?>internal-api/js/core.php"></script>
+    <script type="text/javascript" src="<?php echo HESK_PATH; ?>internal-api/js/core-admin.php"></script>
     <script type="text/javascript" src="<?php echo HESK_PATH; ?>js/jquery.jgrowl.min.js"></script>
     <?php
     if (defined('EXTRA_JS')) {
@@ -224,8 +224,11 @@ $modsForHesk_settings = mfh_getSettings();
         <script src="<?php echo HESK_PATH; ?>js/calendar/moment.js"></script>
         <script src="<?php echo HESK_PATH; ?>js/calendar/fullcalendar.min.js"></script>
         <script src="<?php echo HESK_PATH; ?>js/calendar/mods-for-hesk-calendar.js"></script>
-    <?php }
-    ?>
+    <?php } else if (defined('MFH_CALENDAR_READONLY')) { ?>
+        <script src="<?php echo HESK_PATH; ?>js/calendar/moment.js"></script>
+        <script src="<?php echo HESK_PATH; ?>js/calendar/fullcalendar.min.js"></script>
+        <script src="<?php echo HESK_PATH; ?>js/calendar/mods-for-hesk-calendar-admin-readonly.js"></script>
+    <?php } ?>
 
 </head>
 <body onload="<?php echo $onload;
diff --git a/internal-api/js/core-admin.php b/internal-api/js/core-admin.php
new file mode 100644
index 00000000..ab596ec1
--- /dev/null
+++ b/internal-api/js/core-admin.php
@@ -0,0 +1,15 @@
+<?php
+define('IN_SCRIPT', 1);
+require_once('../../hesk_settings.inc.php');
+header('Content-Type: application/javascript');
+echo "
+var g_isInAdmin = true;
+
+function getHelpdeskUrl() {
+    return '".$hesk_settings['hesk_url']."';
+}
+
+function getAdminDirectory() {
+    return '".$hesk_settings['admin_dir']."';
+}
+";
\ No newline at end of file
diff --git a/internal-api/js/core.php b/internal-api/js/core.php
index c93399e4..b34f0233 100644
--- a/internal-api/js/core.php
+++ b/internal-api/js/core.php
@@ -3,11 +3,9 @@ define('IN_SCRIPT', 1);
 require_once('../../hesk_settings.inc.php');
 header('Content-Type: application/javascript');
 echo "
+var g_isInAdmin = false;
+
 function getHelpdeskUrl() {
     return '".$hesk_settings['hesk_url']."';
 }
-
-function getAdminDirectory() {
-    return '".$hesk_settings['admin_dir']."';
-}
 ";
\ No newline at end of file
diff --git a/js/calendar/mods-for-hesk-customer-calendar.js b/js/calendar/mods-for-hesk-calendar-admin-readonly.js
similarity index 100%
rename from js/calendar/mods-for-hesk-customer-calendar.js
rename to js/calendar/mods-for-hesk-calendar-admin-readonly.js
diff --git a/js/calendar/mods-for-hesk-calendar-readonly.js b/js/calendar/mods-for-hesk-calendar-readonly.js
new file mode 100644
index 00000000..869af40c
--- /dev/null
+++ b/js/calendar/mods-for-hesk-calendar-readonly.js
@@ -0,0 +1,147 @@
+$(document).ready(function() {
+    $('#calendar').fullCalendar({
+        header: {
+            left: 'prevYear,prev,next,nextYear today',
+            center: 'title',
+            right: 'month,agendaWeek,agendaDay'
+        },
+        editable: false,
+        eventLimit: true,
+        timeFormat: 'H:mm',
+        axisFormat: 'H:mm',
+        events: function(start, end, timezone, callback) {
+            $.ajax({
+                url: getHelpdeskUrl() + '/internal-api/calendar/?start=' + start + '&end=' + end,
+                method: 'GET',
+                dataType: 'json',
+                success: function(data) {
+                    var events = [];
+                    $(data).each(function() {
+                        events.push(buildEvent(this.id, this));
+                    });
+                    callback(events);
+                },
+                error: function(data) {
+                    console.error(data);
+                    $.jGrowl($('#lang_error_loading_events').text(), { theme: 'alert-danger', closeTemplate: '' });
+                }
+            });
+        },
+        eventMouseover: function(event) {
+            if (event.type === 'TICKET') {
+                // Don't build a popover for tickets
+                return;
+            }
+
+            var contents = $('.popover-template').html();
+            var $contents = $(contents);
+
+            var format = 'dddd, MMMM Do YYYY';
+            var endDate = event.end == null ? event.start : event.end;
+
+            if (!event.allDay) {
+                format += ', HH:mm';
+            }
+
+            if (event.location === '') {
+                $contents.find('.popover-location').hide();
+            }
+
+            $contents.find('.popover-category span').text(event.categoryName).end()
+                .find('.popover-location span').text(event.location).end()
+                .find('.popover-from span').text(event.start.format(format)).end()
+                .find('.popover-to span').text(endDate.format(format));
+            var $eventMarkup = $(this);
+            $eventMarkup.popover({
+                title: event.title,
+                html: true,
+                content: $contents,
+                animation: true,
+                container: 'body',
+                placement: 'auto'
+            }).popover('show');
+        },
+        eventMouseout: function(event) {
+            if (event.type === 'TICKET') {
+                // There's no popover to destroy
+                return;
+            }
+
+            $(this).popover('destroy');
+        }
+    });
+
+    $('input[name="category-toggle"]').change(updateCategoryVisibility);
+});
+
+function buildEvent(id, dbObject) {
+    if (dbObject.type == 'TICKET') {
+        return {
+            title: dbObject.title,
+            trackingId: dbObject.trackingId,
+            start: moment(dbObject.startTime),
+            url: dbObject.url,
+            color: dbObject.categoryColor === '' || dbObject.categoryColor === null ? '#fff' : dbObject.categoryColor,
+            allDay: true,
+            type: dbObject.type,
+            categoryId: dbObject.categoryId,
+            className: 'category-' + dbObject.categoryId,
+            textColor: calculateTextColor(dbObject.categoryColor)
+        };
+    }
+
+    return {
+        id: id,
+        title: dbObject.title,
+        allDay: dbObject.allDay,
+        start: moment(dbObject.startTime),
+        end: moment(dbObject.endTime),
+        comments: dbObject.comments,
+        location: dbObject.location,
+        type: dbObject.type,
+        categoryId: dbObject.categoryId,
+        categoryName: dbObject.categoryName,
+        className: 'category-' + dbObject.categoryId,
+        color: dbObject.categoryColor === '' || dbObject.categoryColor === null ? '#fff' : dbObject.categoryColor,
+        textColor: calculateTextColor(dbObject.categoryColor),
+        reminderValue: dbObject.reminderValue == null ? '' : dbObject.reminderValue,
+        reminderUnits: dbObject.reminderUnits
+    };
+}
+
+function calculateTextColor(color) {
+    if (color === null || color === '') {
+        return 'black';
+    }
+
+    var red = 0;
+    var green = 0;
+    var blue = 0;
+
+    // If hex value is 3 characters, take each value and concatenate it to itself
+    if (color.length === 3) {
+        red = parseInt(color.substring(1, 2), 16);
+        green = parseInt(color.substring(2, 3), 16);
+        blue = parseInt(color.substring(3, 4), 16);
+    } else {
+        red = parseInt(color.substring(1, 3), 16);
+        green = parseInt(color.substring(3, 5), 16);
+        blue = parseInt(color.substring(5, 7), 16);
+    }
+
+    var gray = red * 0.299 + green * 0.587 + blue * 0.114;
+
+    return gray > 186 ? 'black' : 'white';
+}
+
+function updateCategoryVisibility() {
+    $('input[name="category-toggle"]').each(function() {
+        $this = $(this);
+
+        if ($this.is(':checked')) {
+            $('.category-' + $this.val()).show();
+        } else {
+            $('.category-' + $this.val()).hide();
+        }
+    });
+}
\ No newline at end of file
diff --git a/language/en/text.php b/language/en/text.php
index af738754..a082b67d 100644
--- a/language/en/text.php
+++ b/language/en/text.php
@@ -81,6 +81,7 @@ $hesklang['event_updated'] = 'Event successfully updated';
 $hesklang['error_updating_event'] = 'An error occurred when trying to update the event';
 $hesklang['calendar_title_case'] = 'Calendar';
 $hesklang['calendar_categories'] = 'Categories';
+$hesklang['can_man_calendar'] = 'Can manage calendar events';
 
 // ADDED OR MODIFIED IN Mods for HESK 2.5.2
 $hesklang['manage_statuses'] = 'Manage Statuses';