diff --git a/htdocs/core/modules/modEventOrganization.class.php b/htdocs/core/modules/modEventOrganization.class.php
index b0527ad30b5..77d0cc0c81f 100644
--- a/htdocs/core/modules/modEventOrganization.class.php
+++ b/htdocs/core/modules/modEventOrganization.class.php
@@ -66,7 +66,7 @@ class modEventOrganization extends DolibarrModules
 		// Define some features supported by module (triggers, login, substitutions, menus, css, etc...)
 		$this->module_parts = array(
 			// Set this to 1 if module has its own trigger directory (core/triggers)
-			'triggers' => 0,
+			'triggers' => 1,
 			// Set this to 1 if module has its own login method file (core/login)
 			'login' => 0,
 			// Set this to 1 if module has its own substitution function file (core/substitutions)
diff --git a/htdocs/core/triggers/interface_50_modEventOrganization_EventOrganization.class.php b/htdocs/core/triggers/interface_50_modEventOrganization_EventOrganization.class.php
new file mode 100644
index 00000000000..c5d978c7534
--- /dev/null
+++ b/htdocs/core/triggers/interface_50_modEventOrganization_EventOrganization.class.php
@@ -0,0 +1,123 @@
+<?php
+/* Copyright (C) 2005-2017	Laurent Destailleur 	<eldy@users.sourceforge.net>
+ * Copyright (C) 2021		Florian Henry		<florian.henry@scopen.fr>
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation; either version 3 of the License, or
+ * (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program. If not, see <https://www.gnu.org/licenses/>.
+ */
+
+/**
+ *	\file       htdocs/core/triggers/interface_50_modEventOrganization_EventOrganization.class.php
+ *  \ingroup    eventorganization
+ *  \brief      Trigger file for Event Organization module
+ */
+
+require_once DOL_DOCUMENT_ROOT.'/core/triggers/dolibarrtriggers.class.php';
+
+
+/**
+ *  Class of triggered functions for agenda module
+ */
+class InterfaceEventOrganization extends DolibarrTriggers
+{
+	/**
+	 * Constructor
+	 *
+	 * @param DoliDB $db Database handler
+	 */
+	public function __construct($db)
+	{
+		$this->db = $db;
+
+		$this->name = preg_replace('/^Interface/i', '', get_class($this));
+		$this->family = "eventorganization";
+		$this->description = "Triggers of this module to manage event organization triggers action";
+		// 'development', 'experimental', 'dolibarr' or version
+		$this->version = self::VERSION_DOLIBARR;
+		$this->picto = 'action';
+	}
+
+	/**
+	 * Function called when a Dolibarrr business event is done.
+	 * All functions "runTrigger" are triggered if file is inside directory htdocs/core/triggers or htdocs/module/code/triggers (and declared)
+	 *
+	 * Following properties may be set before calling trigger. The may be completed by this trigger to be used for writing the event into database:
+	 *      $object->actiontypecode (translation action code: AC_OTH, ...)
+	 *      $object->actionmsg (note, long text)
+	 *      $object->actionmsg2 (label, short text)
+	 *      $object->sendtoid (id of contact or array of ids of contacts)
+	 *      $object->socid (id of thirdparty)
+	 *      $object->fk_project
+	 *      $object->fk_element	(ID of object to link action event to)
+	 *      $object->elementtype (->element of object to link action to)
+	 *      $object->module (if defined, elementtype in llx_actioncomm will be elementtype@module)
+	 *
+	 * @param string		$action		Event action code ('CONTRACT_MODIFY', 'RECRUITMENTCANDIDATURE_MODIFIY', ...)
+	 * @param Object		$object     Object
+	 * @param User		    $user       Object user
+	 * @param Translate 	$langs      Object langs
+	 * @param conf		    $conf       Object conf
+	 * @return int         				<0 if KO, 0 if no triggered ran, >0 if OK
+	 */
+	public function runTrigger($action, $object, User $user, Translate $langs, Conf $conf)
+	{
+		if (empty($conf->eventorganization->enabled)) {
+			return 0; // Module not active, we do nothing
+		}
+		$error=0;
+		// Actions
+		if ($action == 'PROJECT_VALIDATE') {
+			// Load translation files required by the page
+			$langs->loadLangs(array("eventorganization"));
+
+			if (!empty($conf->global->EVENTORGANIZATION_TASK_LABEL)) {
+				$taskToDo = explode("\n", $conf->global->EVENTORGANIZATION_TASK_LABEL);
+				if (is_array($taskToDo) && count($taskToDo)>0) {
+					$this->db->begin();
+					foreach ($taskToDo as $taskLabel) {
+						$task = new Task($this->db);
+						$task->label = $taskLabel;
+						$task->fk_project = $object->id;
+						$defaultref = '';
+						$obj = empty($conf->global->PROJECT_TASK_ADDON) ? 'mod_task_simple' : $conf->global->PROJECT_TASK_ADDON;
+						if (!empty($conf->global->PROJECT_TASK_ADDON) && is_readable(DOL_DOCUMENT_ROOT . "/core/modules/project/task/" . $conf->global->PROJECT_TASK_ADDON . ".php")) {
+							require_once DOL_DOCUMENT_ROOT . "/core/modules/project/task/" . $conf->global->PROJECT_TASK_ADDON . '.php';
+							$modTask = new $obj;
+							$defaultref = $modTask->getNextValue($object->thirdparty, null);
+						}
+						if (is_numeric($defaultref) && $defaultref <= 0) {
+							$defaultref = '';
+						}
+						$task->ref = $defaultref;
+						$task->date_start = $object->date_start;
+						$task->date_end = $object->date_end;
+						$result = $task->create($user);
+						if ($result < 0) {
+							$this->errors=array_merge($this->errors, $task->errors);
+							$error++;
+						}
+					}
+				}
+			}
+
+			if (empty($error)) {
+				$this->db->commit();
+				return 1;
+			} else {
+				dol_syslog("InterfaceEventOrganization.class.php: ".implode(',', $this->errors), LOG_ERR);
+				$this->db->rollback();
+				return -1;
+			}
+		}
+	}
+}