diff --git a/e2e/cypress/e2e/events/edit_event.cy.ts b/e2e/cypress/e2e/events/edit_event.cy.ts
index cf3072ed9..0c78b9631 100644
--- a/e2e/cypress/e2e/events/edit_event.cy.ts
+++ b/e2e/cypress/e2e/events/edit_event.cy.ts
@@ -1,10 +1,14 @@
-import {setup, login, waitForPageLoad, SubNavBar, Workqueue, Modal} from '../../support/common';
+import {cloneDeep} from 'lodash';
+
+import {setup, login, waitForPageLoad, SubNavBar, Workqueue, Modal, addItems} from '../../support/common';
 import {EventEditor, PlanningList} from '../../support/planning';
+import {TEST_EVENTS} from '../../fixtures/events';
+
+const list = new PlanningList();
+const editor = new EventEditor();
 
 describe('Planning.Events: edit metadata', () => {
-    const editor = new EventEditor();
     const subnav = new SubNavBar();
-    const list = new PlanningList();
     const workqueue = new Workqueue();
     const modal = new Modal();
     let event;
@@ -173,3 +177,60 @@ describe('Planning.Events: edit metadata', () => {
             .should('be.enabled');
     });
 });
+
+describe('Planing.Events: edit existing events', () => {
+    beforeEach(() => {
+        setup({fixture_profile: 'planning_prepopulate_data'}, '/#/planning');
+        addItems('events', [{
+            ...cloneDeep(TEST_EVENTS.date_01_02_2045),
+            dates: {
+                start: TEST_EVENTS.date_01_02_2045.dates.start,
+                end: TEST_EVENTS.date_01_02_2045.dates.end,
+            },
+        }, {
+            ...cloneDeep(TEST_EVENTS.date_02_02_2045),
+            dates: {
+                start: TEST_EVENTS.date_02_02_2045.dates.start,
+                end: TEST_EVENTS.date_02_02_2045.dates.end,
+                tz: null,
+            },
+        }]);
+        login();
+
+        waitForPageLoad.planning();
+    });
+
+    it('SDESK-6972: Edit events with no timezone', () => {
+        // Test if we can edit an Event without a timezone value
+        list.item(0)
+            .dblclick();
+        editor.waitTillOpen();
+        editor.waitLoadingComplete();
+
+        editor.type({definition_short: 'Modifying 1st event'});
+        editor.waitForAutosave();
+        editor.saveButton
+            .should('exist')
+            .click();
+        editor.closeButton
+            .should('exist')
+            .click();
+        editor.waitTillClosed();
+
+        // test if we can edit an Event with a timezone value of `null`
+        list.item(1)
+            .dblclick();
+        editor.waitTillOpen();
+        editor.waitLoadingComplete();
+
+        editor.type({definition_short: 'Modifying 2nd event'});
+        editor.waitForAutosave();
+        editor.saveButton
+            .should('exist')
+            .click();
+        editor.closeButton
+            .should('exist')
+            .click();
+        editor.waitTillClosed();
+    });
+});
diff --git a/server/features/events.feature b/server/features/events.feature
index f7bd48396..30505f33d 100644
--- a/server/features/events.feature
+++ b/server/features/events.feature
@@ -1376,4 +1376,32 @@ Feature: Events
         {
             "assignment_id": null
         }
-        """
\ No newline at end of file
+        """
+
+    @auth
+    Scenario: Create events without a timezone
+        When we post to "/events"
+        """
+        [{
+            "guid": "event1",
+            "name": "No timezone defined",
+            "dates": {
+                "start": "2029-11-21T12:00:00.000Z",
+                "end": "2029-11-21T14:00:00.000Z"
+            }
+        }]
+        """
+        Then we get OK response
+        When we post to "/events"
+        """
+        [{
+            "guid": "event2",
+            "name": "null timezone",
+            "dates": {
+                "start": "2029-11-21T12:00:00.000Z",
+                "end": "2029-11-21T14:00:00.000Z",
+                "tz": null
+            }
+        }]
+        """
+        Then we get OK response
\ No newline at end of file
diff --git a/server/planning/events/events_schema.py b/server/planning/events/events_schema.py
index 54134d973..4c207a78b 100644
--- a/server/planning/events/events_schema.py
+++ b/server/planning/events/events_schema.py
@@ -101,7 +101,10 @@
                 "type": "datetime",
                 "nullable": True,
             },
-            "tz": {"type": "string"},
+            "tz": {
+                "type": "string",
+                "nullable": True,
+            },
             "end_tz": {"type": "string"},
             "all_day": {"type": "boolean"},
             "no_end_time": {"type": "boolean"},