diff --git a/Admin/Install/db.json b/Admin/Install/db.json
index 257e1b1..7b5eaae 100755
--- a/Admin/Install/db.json
+++ b/Admin/Install/db.json
@@ -167,5 +167,31 @@
                 "foreignKey": "account_id"
             }
         }
+    },
+    "calendar_event_tag": {
+        "name": "calendar_event_tag",
+        "fields": {
+            "calendar_event_tag_id": {
+                "name": "calendar_event_tag_id",
+                "type": "INT",
+                "null": false,
+                "primary": true,
+                "autoincrement": true
+            },
+            "calendar_event_tag_src": {
+                "name": "calendar_event_tag_src",
+                "type": "INT",
+                "null": false,
+                "foreignTable": "calendar_event",
+                "foreignKey": "calendar_event_id"
+            },
+            "calendar_event_tag_dst": {
+                "name": "calendar_event_tag_dst",
+                "type": "INT",
+                "null": false,
+                "foreignTable": "tag",
+                "foreignKey": "tag_id"
+            }
+        }
     }
 }
\ No newline at end of file
diff --git a/Docs/Dev/img/er.png b/Docs/Dev/img/er.png
new file mode 100644
index 0000000..3af9741
Binary files /dev/null and b/Docs/Dev/img/er.png differ
diff --git a/Models/Event.php b/Models/Event.php
index cd4b76d..6f12731 100755
--- a/Models/Event.php
+++ b/Models/Event.php
@@ -17,6 +17,8 @@ namespace Modules\Calendar\Models;
 use Modules\Admin\Models\Account;
 use Modules\Admin\Models\NullAccount;
 use phpOMS\Stdlib\Base\Location;
+use Modules\Tag\Models\NullTag;
+use Modules\Tag\Models\Tag;
 
 /**
  * Event class.
@@ -120,6 +122,14 @@ class Event
      */
     private array $people = [];
 
+    /**
+     * Tags.
+     *
+     * @var Tag[]
+     * @since 1.0.0
+     */
+    protected array $tags = [];
+
     /**
      * Constructor.
      *
@@ -298,4 +308,70 @@ class Event
     {
         return $this->schedule;
     }
+
+    /**
+     * Adding new tag.
+     *
+     * @param Tag $tag Tag
+     *
+     * @return int
+     *
+     * @since 1.0.0
+     */
+    public function addTag(Tag $tag) : int
+    {
+        $this->tags[] = $tag;
+
+        \end($this->tags);
+        $key = (int) \key($this->tags);
+        \reset($this->tags);
+
+        return $key;
+    }
+
+    /**
+     * Remove Tag from list.
+     *
+     * @param int $id Tag
+     *
+     * @return bool
+     *
+     * @since 1.0.0
+     */
+    public function removeTag($id) : bool
+    {
+        if (isset($this->tags[$id])) {
+            unset($this->tags[$id]);
+
+            return true;
+        }
+
+        return false;
+    }
+
+    /**
+     * Get task elements.
+     *
+     * @return Tag[]
+     *
+     * @since 1.0.0
+     */
+    public function getTags() : array
+    {
+        return $this->tags;
+    }
+
+    /**
+     * Get task elements.
+     *
+     * @param int $id Element id
+     *
+     * @return Tag
+     *
+     * @since 1.0.0
+     */
+    public function getTag(int $id) : Tag
+    {
+        return $this->tags[$id] ?? new NullTag();
+    }
 }
diff --git a/Models/EventMapper.php b/Models/EventMapper.php
index b6edd13..691a792 100755
--- a/Models/EventMapper.php
+++ b/Models/EventMapper.php
@@ -16,6 +16,7 @@ namespace Modules\Calendar\Models;
 
 use Modules\Admin\Models\AccountMapper;
 use phpOMS\DataStorage\Database\DataMapperAbstract;
+use Modules\Tag\Models\TagMapper;
 
 /**
  * Mapper class.
@@ -72,6 +73,21 @@ final class EventMapper extends DataMapperAbstract
         ],
     ];
 
+    /**
+     * Has many relation.
+     *
+     * @var array<string, array{mapper:string, table:string, self?:?string, external?:?string, column?:string}>
+     * @since 1.0.0
+     */
+    protected static array $hasMany = [
+        'tags'         => [
+            'mapper'   => TagMapper::class,
+            'table'    => 'calendar_event_tag',
+            'external' => 'calendar_event_tag_dst',
+            'self'     => 'calendar_event_tag_src',
+        ],
+    ];
+
     /**
      * Primary table.
      *