diff --git a/lib/LMS.class.php b/lib/LMS.class.php
index e9e5474d74..72e16ebb5e 100644
--- a/lib/LMS.class.php
+++ b/lib/LMS.class.php
@@ -3516,6 +3516,18 @@ public function GetEventList(array $params)
         return $manager->GetEventList($params);
     }
 
+    public function EventOpen($id)
+    {
+        $manager = $this->getEventManager();
+        return $manager->EventOpen($id);
+    }
+
+    public function EventClose($params)
+    {
+        $manager = $this->getEventManager();
+        return $manager->EventClose($params);
+    }
+
     public function GetCustomerIdByTicketId($id)
     {
         $manager = $this->getEventManager();
diff --git a/lib/LMSManagers/LMSEventManager.php b/lib/LMSManagers/LMSEventManager.php
index fef6cb65f3..64c82d9e35 100644
--- a/lib/LMSManagers/LMSEventManager.php
+++ b/lib/LMSManagers/LMSEventManager.php
@@ -675,6 +675,107 @@ public function EventSearch($search, $order = 'date,asc', $simple = false)
         }
     }
 
+    /**
+     * @param array $params associative array of parameters described below:
+     *      id - id of event to close, single integer value,
+     *      ticketid - assigned ticketid of all events to close
+     */
+
+    public function EventClose($params)
+    {
+        if (!ConfigHelper::checkPrivilege('timetable_mangement')) {
+            die('Error - cannot close event(s) - no permissions');
+        }
+        if (empty($params)) {
+            die('Error - cannot close event(s)');
+        }
+
+        if (!empty($params['ticketid'])) {
+            $where = 'closed = 0 AND ticketid = ?';
+            $sqlreplacedata = $params['ticketid'];
+            $helpdesk_manager = new LMSHelpdeskManager($this->db, $this->auth, $this->cache);
+            $ids = $helpdesk_manager->GetEventsByTicketId($params['ticketid']);
+            $ids = $ids ?? $params['id'];
+
+            foreach ($ids as $id) {
+                $helpdesk_manager->TicketMessageAdd(array(
+                    'ticketid' => $params['ticketid'],
+                    'messageid' => '<msg.' . $params['ticketid'] . $id['id'] . '.' . time() . '@rtsystem.' . gethostname() . '>',
+                    'body' => trans('Assigned event ($a) was closed.', $a = $id['id']),
+                    'type' => RTMESSAGE_ASSIGNED_EVENT_CHANGE,
+                ));
+            }
+        } else {
+            $where = 'id = ?';
+            $sqlreplacedata = $params['id'];
+            $ids = array($params['id']);
+        }
+
+        if ($this->syslog) {
+            foreach ($ids as $id) {
+                $this->syslog->AddMessage(
+                    SYSLOG::RES_EVENT,
+                    SYSLOG::OPER_UPDATE,
+                    $id,
+                    array('mod' . SYSLOG::getResourceKey(SYSLOG::RES_USER))
+                );
+            }
+        }
+
+        return $this->db->Execute(
+            'UPDATE events
+                SET closed = 1, closeduserid = ?, closeddate = ?NOW?
+                WHERE ' . $where,
+            array(Auth::GetCurrentUser(), $sqlreplacedata)
+        );
+    }
+
+    public function EventOpen($id)
+    {
+        if (!ConfigHelper::checkPrivilege('timetable_mangement')) {
+            die('Error - cannot open event(s) - no permissions');
+        }
+
+        $aee = ConfigHelper::getConfig(
+            'timetable.allow_modify_closed_events_newer_than',
+            ConfigHelper::getConfig('phpui.allow_modify_closed_events_newer_than', 604800)
+        );
+        $event = $this->GetEvent($id);
+        if (empty($event['closed'])) {
+            die('Cannot open event - event not closed');
+        }
+        if (!ConfigHelper::checkPrivilege('superuser') && $aee && ((time() - $event['closeddate']) < $aee)) {
+            die('Cannot open event - event closed too long ago');
+        }
+
+        if ($this->syslog) {
+            $this->syslog->AddMessage(
+                SYSLOG::RES_EVENT,
+                SYSLOG::OPER_UPDATE,
+                $id,
+                array('mod' . SYSLOG::getResourceKey(SYSLOG::RES_USER))
+            );
+        }
+
+        if (!empty($event['ticketid'])) {
+            $helpdesk_manager = new LMSHelpdeskManager($this->db, $this->auth, $this->cache);
+            $ticketqueue = $helpdesk_manager->GetQueueByTicketId($event['ticketid']);
+
+            $helpdesk_manager->TicketMessageAdd(array(
+                'ticketid' => $event['ticketid'],
+                'messageid' => '<msg.' . $ticketqueue['id'] . '.' . $event['ticketid'] . '.' . time() . '@rtsystem.' . gethostname() . '>',
+                'body' => trans('Assigned event ($a) was opened.', $a = $id),
+                'type' => RTMESSAGE_ASSIGNED_EVENT_CHANGE,
+            ));
+        }
+
+        return $this->db->Execute(
+            'UPDATE events SET closed = 0, closeduserid = NULL, closeddate = 0
+              WHERE id = ?',
+            array($id)
+        );
+    }
+
     public function GetCustomerIdByTicketId($id)
     {
         return $this->db->GetOne('SELECT customerid FROM rttickets WHERE id=?', array($id));
diff --git a/lib/locale/pl_PL/strings.php b/lib/locale/pl_PL/strings.php
index 71f051203e..959c5eee10 100644
--- a/lib/locale/pl_PL/strings.php
+++ b/lib/locale/pl_PL/strings.php
@@ -4800,6 +4800,8 @@
 $_LANG['Assigned event ($a) was created.'] = 'Utworzono przypisane zdarzenie ($a).';
 $_LANG['Assigned event ($a) was modified.'] = 'Zmodyfikowano przypisane zdarzenie ($a).';
 $_LANG['Assigned event ($a) was deleted.'] = 'Usunięto przypisane zdarzenie ($a).';
+$_LANG['Assigned event ($a) was opened.'] = 'Przypisane zdarzenie ($a) zostało otwarte.';
+$_LANG['Assigned event ($a) was closed.'] = 'Przypisane zdarzenie ($a) zostało zamknięte.';
 
 $_LANG['New ticket body should not be empty if you set new ticket subject!'] = 'Treść powiadomienia o nowym zgłoszeniu nie może być pusta w sytuacji, gdy ustawiono temat powiadomienia o nowym zgłoszeniu!';
 $_LANG['New ticket subject should not be empty if you set new ticket body!'] = 'Temat powiadomienia o nowym zgłoszeniu nie może być pusty w sytuacji, gdy ustawiono treść powiadomienia o nowym zgłoszeniu!';
diff --git a/modules/eventedit.php b/modules/eventedit.php
index f44980c012..383e4f55ab 100644
--- a/modules/eventedit.php
+++ b/modules/eventedit.php
@@ -37,9 +37,14 @@
 $max_userlist_size = ConfigHelper::getConfig('timetable.event_max_userlist_size', ConfigHelper::getConfig('phpui.event_max_userlist_size'));
 $big_networks = ConfigHelper::checkConfig('phpui.big_networks');
 $now = time();
+$currentuser = Auth::GetCurrentUser();
 
-if (isset($_GET['id'])) {
-    $event = $LMS->GetEvent($_GET['id']);
+$action = isset($_GET['action']) ? $_GET['action'] : null;
+$id = !empty($_GET['id']) ? intval($_GET['id']) : null;
+$ticketid = !empty($_GET['ticketid']) ? intval($_GET['ticketid']) : null;
+
+if (!empty($id)) {
+    $event = $LMS->GetEvent($id);
     if (empty($event)) {
         $SESSION->redirect('?m=eventlist');
     }
@@ -62,11 +67,10 @@
 $backid = $SESSION->get('backid');
 $backurl = '?' . $backto . (empty($backid) ? '' : '#' . $backid);
 
-$action = isset($_GET['action']) ? $_GET['action'] : null;
 switch ($action) {
     case 'open':
         if (empty($event['closeddate']) || ($event['closed'] == 1 && $aee && ($now - $event['closeddate'] < $aee)) || $superuser) {
-            $DB->Execute('UPDATE events SET closed = 0, closeduserid = NULL, closeddate = 0 WHERE id = ?', array($_GET['id']));
+            $LMS->EventOpen($id);
             $SESSION->remove_history_entry();
             $SESSION->redirect($backurl);
         } else {
@@ -75,17 +79,16 @@
         break;
     case 'close':
         $SESSION->remove_history_entry();
-        if (isset($_GET['ticketid'])) {
-            $DB->Execute('UPDATE events SET closed = 1, closeduserid = ?, closeddate = ?NOW? WHERE closed = 0 AND ticketid = ?', array(Auth::GetCurrentUser(), $_GET['ticketid']));
-            $SESSION->redirect($backurl);
+        if (isset($ticketid)) {
+            $LMS->EventClose(array('ticketid' => $ticketid));
         } else {
-            $DB->Execute('UPDATE events SET closed = 1, closeduserid = ?, closeddate = ?NOW? WHERE id = ?', array(Auth::GetCurrentUser(), $_GET['id']));
-            $SESSION->redirect($backurl);
+            $LMS->EventClose(array('id' => $id));
         }
+        $SESSION->redirect($backurl);
         break;
     case 'assign':
         if ($event['closed'] != 1 || ($event['closed'] == 1 && $aee && (($now - $event['closeddate']) < $aee)) || $superuser) {
-            $LMS->AssignUserToEvent($_GET['id'], Auth::GetCurrentUser());
+            $LMS->AssignUserToEvent($id, $currentuser);
             $SESSION->remove_history_entry();
             $SESSION->redirect($backurl);
         } else {
@@ -94,7 +97,7 @@
         break;
     case 'unassign':
         if ($event['closed'] != 1 || ($event['closed'] == 1 && $aee && (($now - $event['closeddate']) < $aee)) || $superuser) {
-            $LMS->UnassignUserFromEvent($_GET['id'], Auth::GetCurrentUser());
+            $LMS->UnassignUserFromEvent($id, $currentuser);
             $SESSION->remove_history_entry();
             $SESSION->redirect($backurl);
         } else {