diff --git a/.env.example b/.env.example
index de4e8a7..d798b03 100644
--- a/.env.example
+++ b/.env.example
@@ -3,5 +3,9 @@ UNTIS_USERNAME=
 UNTIS_PASSWORD=
 UNTIS_BASEURL=
 
+#MAINTENANCE_TITLE=
+#MAINTENANCE_DESCRIPTION=
+#MAINTENANCE_LOCATION=
+
 # Optionally set the cors origin to use with untis-ics-sync-ui
 #CORS_ORIGIN=
diff --git a/src/lessons/lessons.service.ts b/src/lessons/lessons.service.ts
index 2c4a688..1d2706d 100644
--- a/src/lessons/lessons.service.ts
+++ b/src/lessons/lessons.service.ts
@@ -84,7 +84,8 @@ export class LessonsService {
               endInputType: 'local',
               endOutputType: 'utc',
             } as EventAttributes),
-        ),
+        )
+        .concat([this.createMaintenanceEvent()]),
     );
 
     if (error) {
@@ -94,4 +95,28 @@ export class LessonsService {
 
     return value;
   }
+
+  createMaintenanceEvent() {
+    const {
+      MAINTENANCE_TITLE: title,
+      MAINTENANCE_DESCRIPTION: description,
+      MAINTENANCE_LOCATION: location,
+    } = process.env;
+    const today = new Date();
+    return title
+      ? ({
+          title: title ?? 'Maintenance',
+          description,
+          location,
+
+          start: [today.getFullYear(), today.getMonth() + 1, today.getDate()],
+          startInputType: 'local',
+          startOutputType: 'utc',
+
+          end: [today.getFullYear(), today.getMonth() + 1, today.getDate()],
+          endInputType: 'local',
+          endOutputType: 'utc',
+        } as EventAttributes)
+      : undefined;
+  }
 }