diff --git a/docsource/modules170-180.rst b/docsource/modules170-180.rst
index 2b899f408390..9d7c557c7a53 100644
--- a/docsource/modules170-180.rst
+++ b/docsource/modules170-180.rst
@@ -96,7 +96,7 @@ Module coverage 17.0 -> 18.0
 +---------------------------------------------------+----------------------+-------------------------------------------------+
 | bus                                               |Nothing to do         |                                                 |
 +---------------------------------------------------+----------------------+-------------------------------------------------+
-| calendar                                          |                      |                                                 |
+| calendar                                          |Done                  |                                                 |
 +---------------------------------------------------+----------------------+-------------------------------------------------+
 | calendar_sms                                      |                      |No DB layout changes.                            |
 +---------------------------------------------------+----------------------+-------------------------------------------------+
diff --git a/openupgrade_scripts/scripts/calendar/18.0.1.1/post-migration.py b/openupgrade_scripts/scripts/calendar/18.0.1.1/post-migration.py
new file mode 100644
index 000000000000..95d093b2bd2a
--- /dev/null
+++ b/openupgrade_scripts/scripts/calendar/18.0.1.1/post-migration.py
@@ -0,0 +1,18 @@
+# Copyright 2025 ForgeFlow S.L. (https://www.forgeflow.com)
+# License AGPL-3.0 or later (https://www.gnu.org/licenses/agpl).
+from openupgradelib import openupgrade
+
+
+@openupgrade.migrate()
+def migrate(env, version):
+    openupgrade.load_data(env, "calendar", "18.0.1.1/noupdate_changes.xml")
+    openupgrade.delete_record_translations(
+        env.cr,
+        "calendar",
+        [
+            "calendar_template_meeting_changedate",
+            "calendar_template_meeting_invitation",
+            "calendar_template_meeting_reminder",
+            "calendar_template_meeting_update",
+        ],
+    )
diff --git a/openupgrade_scripts/scripts/calendar/18.0.1.1/upgrade_analysis_work.txt b/openupgrade_scripts/scripts/calendar/18.0.1.1/upgrade_analysis_work.txt
new file mode 100644
index 000000000000..cefb24e572fa
--- /dev/null
+++ b/openupgrade_scripts/scripts/calendar/18.0.1.1/upgrade_analysis_work.txt
@@ -0,0 +1,14 @@
+---Models in module 'calendar'---
+---Fields in module 'calendar'---
+calendar     / res.users.settings       / calendar_default_privacy (selection): NEW required, selection_keys: ['confidential', 'private', 'public'], hasdefault: default
+# NOTHING TO DO
+
+---XML records in module 'calendar'---
+DEL ir.actions.act_window: calendar.action_view_start_calendar_sync
+NEW ir.ui.view: calendar.res_users_form_view
+NEW ir.ui.view: calendar.res_users_form_view_calendar_default_privacy
+# NOTHING TO DO
+
+DEL onboarding.onboarding: calendar.onboarding_onboarding_calendar (noupdate)
+DEL onboarding.onboarding.step: calendar.onboarding_onboarding_step_setup_calendar_integration (noupdate)
+# DONE: post-migration: safely delete