diff --git a/packages/volto/news/7993.bugfix b/packages/volto/news/7993.bugfix
new file mode 100644
index 0000000000..c86c54f1ba
--- /dev/null
+++ b/packages/volto/news/7993.bugfix
@@ -0,0 +1 @@
+Fixed the requirement to set the end date when "open end" is checked. @TimoBroeskamp
\ No newline at end of file
diff --git a/packages/volto/src/components/manage/Widgets/DatetimeWidget.jsx b/packages/volto/src/components/manage/Widgets/DatetimeWidget.jsx
index b509f86b6b..a64cda768e 100644
--- a/packages/volto/src/components/manage/Widgets/DatetimeWidget.jsx
+++ b/packages/volto/src/components/manage/Widgets/DatetimeWidget.jsx
@@ -111,6 +111,10 @@ const DatetimeWidgetComponent = (props) => {
   if (id === 'end' && formData?.open_end) {
     return null;
   }
+  // If open_end is checked set formData.end to formData.start
+  if (formData?.open_end === true) {
+    formData.end = formData.start;
+  }
 
   const getInternalValue = () => {
     return parseDateTime(toBackendLang(lang), value, undefined, moment.default);
diff --git a/packages/volto/src/helpers/FormValidation/validators.ts b/packages/volto/src/helpers/FormValidation/validators.ts
index af87f4baf0..28bf661ac4 100644
--- a/packages/volto/src/helpers/FormValidation/validators.ts
+++ b/packages/volto/src/helpers/FormValidation/validators.ts
@@ -160,7 +160,8 @@ export const startEventDateRangeValidator = ({
   formatMessage,
 }: Validator) => {
   const isValid =
-    value && formData.end && new Date(value) < new Date(formData.end);
+    (value && formData.end && new Date(value) < new Date(formData.end)) ||
+    (formData.open_end && formData.start === formData.end);
   return !isValid
     ? formatMessage(messages.startEventRange, {
         endDateValueOrEndFieldName: formData.end || 'end',
@@ -175,7 +176,8 @@ export const endEventDateRangeValidator = ({
   formatMessage,
 }: Validator) => {
   const isValid =
-    value && formData.start && new Date(value) > new Date(formData.start);
+    (value && formData.start && new Date(value) > new Date(formData.start)) ||
+    (formData.open_end && formData.start === formData.end);
   return !isValid
     ? formatMessage(messages.endEventRange, {
         startDateValueOrStartFieldName: formData.start || 'start',